Display device

Abstract

A display device includes a transistor provided over a first substrate; an insulating layer provided over the transistor; a first electrode provided over the insulating layer; a spacer provided over the first electrode and the insulating layer, the opening being defined by the spacer; a light emitting element layer provided in the opening; and a second electrode provided over the light emitting element layer and the spacer. The insulating layer includes a first region and a third region each having a different height from each other, and a second region having an inclined surface connecting the first region and the third region, the first region has a lower height than the third region, and the first electrode overlaps with the first region in a direction perpendicular to the first substrate.

Description

[0001] This application claims priority to Korean Patent Application No. 10-2019-0123992, filed on October 7, 2019, and all benefits derived therefrom, the contents of which are incorporated herein by reference in their entirety. Technical Field

[0002] This disclosure relates to display devices, and more particularly, to display devices having improved luminous efficiency. Background Technology

[0003] In display devices that display images, light-emitting diode (LED) displays have become a focus of attention.

[0004] Unlike liquid crystal displays (“LCD”), light-emitting diode (LED) displays are self-emissive and may not require a separate light source, thus allowing for reduced thickness and weight. Furthermore, LED displays can possess desired quality characteristics such as low power consumption, high brightness, and high response speed.

[0005] Generally, a light-emitting diode (LED) display includes a substrate, a plurality of thin-film transistors disposed on the substrate, a plurality of insulating layers disposed between the thin-film transistors, and light-emitting elements connected to the thin-film transistors.

[0006] Recently, display devices that include color conversion layers have been proposed to achieve high-efficiency display devices. Summary of the Invention

[0007] Exemplary embodiments aim to provide a display device that has improved light emission efficiency by increasing the reflectivity of light emitted from the light-emitting element and reducing the absorption of light emitted from the light-emitting element.

[0008] According to an embodiment of the present invention, a display device includes: a transistor disposed on a first substrate; an insulating layer disposed on the transistor; a first electrode disposed on the insulating layer; a spacer disposed on the first electrode and the insulating layer, wherein an opening is defined by the spacer; a light-emitting element layer disposed in the opening; and a second electrode disposed on the light-emitting element layer and the spacer, wherein the insulating layer includes a first region and a third region having different heights from each other and a second region having an inclined surface connecting the first region and the third region, the first region having a lower height than the third region, and the first electrode overlapping the first region in a direction perpendicular to the first substrate.

[0009] In some embodiments, the separator may include an inorganic material containing silicon.

[0010] In an implementation, the separator may further include carbon.

[0011] In this embodiment, the separator may include materials selected from SiO2.x SiN x SiO x N y and at least one of the following materials: siloxanes.

[0012] In this implementation, the thickness of the separator can be approximately to approximately Within the range.

[0013] In this embodiment, the refractive index difference between the separator and the light-emitting element layer may be less than about 50% of the refractive index of the separator.

[0014] In one implementation, the barrier may have an inclined surface that overlaps with the second region.

[0015] In one embodiment, the first electrode in the second region may be disposed between the insulating layer and the separator.

[0016] In one embodiment, the lowermost surface of the second electrode may be closer to the first substrate than the uppermost surface of the separator.

[0017] In one embodiment, the lower surface of the second electrode may be positioned at the same height as the upper surface of the opening in the separator.

[0018] In one embodiment, the uppermost surface of the separator may be positioned closer to the first substrate than the lowermost surface of the second electrode.

[0019] In one embodiment, the system may further include a second substrate that overlaps with the first substrate, and a color conversion layer disposed on the second substrate, wherein the color conversion layer may be configured to overlap with the light-emitting element layer in a direction perpendicular to the first substrate.

[0020] In one implementation, the light-emitting element layer can emit blue light.

[0021] In some embodiments, the separator may include organic materials.

[0022] According to another embodiment of the present invention, a display device includes: a transistor disposed on a substrate; an insulating layer disposed on the transistor; a first electrode disposed on the insulating layer; a reflective member disposed between the insulating layer and the first electrode; a spacer disposed on the first electrode and the insulating layer, wherein an opening is defined by the spacer; a light-emitting element layer disposed in the opening; and a second electrode disposed on the light-emitting element layer and the spacer, wherein a side surface of the reflective member adjacent to the opening includes an inclined surface.

[0023] In some embodiments, the reflective component may include metal.

[0024] In an embodiment, the reflective member may have a multilayer structure of one of Ti / Al / Ti, Mo / Al / Mo, and Ti / Cu.

[0025] In one embodiment, the first electrode may be disposed on the reflective member.

[0026] In one embodiment, the isolator may be disposed on the reflective member, and the first electrode may be disposed between the reflective member and the isolator on the inclined surface of the reflective member.

[0027] In one embodiment, the lowermost surface of the second electrode may be closer to the first substrate than the uppermost surface of the separator.

[0028] In one embodiment, the lower surface of the second electrode may be positioned at the same height as the upper surface of the opening in the separator.

[0029] In one embodiment, the uppermost surface of the separator may be closer to the first substrate than the lowermost surface of the second electrode.

[0030] According to another embodiment of the present invention, a display device includes: a transistor disposed on a substrate; an insulating layer disposed on the transistor; a first electrode disposed on the insulating layer; a reflective member disposed on the first electrode; a spacer disposed on the first electrode, the reflective member, and the insulating layer, wherein an opening is defined by the spacer; a light-emitting element layer disposed in the opening; and a second electrode disposed on the light-emitting element layer and the spacer, wherein a side surface of the reflective member adjacent to the opening includes an inclined surface.

[0031] In some embodiments, the reflective component may include metal.

[0032] In an embodiment, the reflective member may have a multilayer structure of one of Ti / Al / Ti, Mo / Al / Mo, and Ti / Cu.

[0033] In one embodiment, a portion of the reflective member may not overlap with the first electrode in a direction perpendicular to the first substrate.

[0034] In one embodiment, one side surface of the reflective member and one side surface of the first electrode can be aligned with each other.

[0035] In one embodiment, the lowermost surface of the second electrode may be closer to the first substrate than the uppermost surface of the separator.

[0036] In one embodiment, the lower surface of the second electrode may be positioned at the same height as the upper surface of the opening in the separator.

[0037] In one embodiment, the uppermost surface of the separator may be configured to be closer to the first substrate than the lowermost surface of the second electrode.

[0038] In this implementation, the isolator may be disposed on the reflective member.

[0039] According to an embodiment of the present invention, a display device is provided that has improved light emission efficiency by increasing the reflectivity of light emitted from the light-emitting element and reducing light absorption. Attached Figure Description

[0040] Figure 1 A cross-sectional view of a display device according to an exemplary embodiment of the present invention is shown schematically.

[0041] Figure 2 The composition depends on polyimide (“PI”) as an organic material, siloxane as an inorganic material, and SiN. x A graph showing the refractive index and extinction coefficient at wavelength.

[0042] Figure 3 A cross-sectional view showing a display device according to an alternative exemplary embodiment of the present invention.

[0043] Figure 4 A cross-sectional view of a display device according to another alternative exemplary embodiment of the present invention.

[0044] Figure 5 A cross-sectional view of a display device according to another alternative exemplary embodiment of the present invention.

[0045] Figure 6 A cross-sectional view of a display device according to another alternative exemplary embodiment of the present invention.

[0046] Figure 7 A cross-sectional view of a display device according to another alternative exemplary embodiment of the present invention.

[0047] Figure 8 A cross-sectional view of a display device according to another alternative exemplary embodiment of the present invention.

[0048] Figure 9 A cross-sectional view of a display device according to another alternative exemplary embodiment of the present invention.

[0049] Figure 10 A cross-sectional view of a display device according to another alternative exemplary embodiment of the present invention.

[0050] Figure 11 A cross-sectional view of a display device according to another alternative exemplary embodiment of the present invention.

[0051] Figure 12 A cross-sectional view of a display device according to another alternative exemplary embodiment of the present invention.

[0052] Figure 13A cross-sectional view of a display device according to another alternative exemplary embodiment of the present invention.

[0053] Figure 14 A cross-sectional view of a display device according to another alternative exemplary embodiment of the present invention.

[0054] Figure 15 A top view of a display panel according to an exemplary embodiment of the present invention is shown for illustrative purposes.

[0055] Figure 16 For along Figure 15 The cross-sectional view taken by line XVI-XVI'.

[0056] Figure 17 A cross-sectional view of a display device according to an alternative exemplary embodiment is shown.

[0057] Figure 18 This is a cross-sectional view of a display device according to another alternative exemplary embodiment.

[0058] Figure 19 This is a cross-sectional view of a display device according to another alternative exemplary embodiment.

[0059] Figure 20 This is a circuit diagram of the pixels of a display device according to an exemplary embodiment.

[0060] Figure 21 This is a layout diagram of a plurality of pixels PX1, PX2 and PX3 of a display substrate according to an exemplary embodiment.

[0061] Figure 22 For along Figure 21 The cross-sectional view of the display device is taken from line XXII-XXII'.

[0062] Figures 23 to 25 A cross-sectional view of a display device according to an alternative exemplary embodiment is shown. Detailed Implementation

[0063] The invention will be described more fully below with reference to the accompanying drawings, in which exemplary embodiments of the invention are shown. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of the invention.

[0064] For clarity in describing the invention, parts irrelevant to the description will be omitted. Similar reference numerals throughout the specification denote similar elements.

[0065] Furthermore, for ease of understanding and description, the dimensions and thicknesses of each structure shown in the accompanying drawings are arbitrarily illustrated, but the invention is not limited thereto. In the drawings, the thicknesses of layers, films, panels, regions, etc., are enlarged for clarity. In the drawings, the thicknesses of some layers and regions are enlarged for better understanding and ease of description.

[0066] It will be understood that when an element, such as a layer, film, region, or substrate, is referred to as being "on" another element, it may be directly on the other element, or there may be intermediate elements present. Conversely, when an element is referred to as being "directly" on another element, there are no intermediate elements present. Furthermore, in the specification, the terms "on" or "above" mean placed on or below the object portion, and do not necessarily mean placed on the upper side of the object portion based on the direction of gravity.

[0067] Furthermore, unless explicitly stated otherwise, the words “comprise” and variations such as “comprises” or “comprising” will be understood to imply inclusion of the stated element, but not to exclude any other element.

[0068] Furthermore, in the specification, the phrase "in a plan view" means when viewing the object portion from above, and the phrase "in a cross section" means when viewing a cross section taken by vertically cutting the object portion from the side.

[0069] The following description, with reference to the accompanying drawings, details a display device according to an exemplary embodiment of the present invention.

[0070] Figure 1 The diagram is intended to schematically illustrate a display device according to an exemplary embodiment of the present invention. For ease of illustration and description, Figure 1 The illustration schematically shows a portion of an exemplary embodiment of a display device according to the present invention, and the actual cross-sectional structure of the display device may be compared with... Figure 1 The cross-sectional structures shown in the images are different.

[0071] refer to Figure 1 An exemplary embodiment of the display device includes a first substrate 110, and a transistor TFT and an insulating layer 180 disposed on the first substrate 110.

[0072] In this embodiment, the first electrode 191 is connected to the transistor TFT via a contact hole 185 defined or formed in the insulating layer 180. Although Figure 1 The diagram schematically illustrates a transistor TFT, but the transistor TFT includes a gate electrode, a semiconductor layer, a source electrode, and a drain electrode, and a first electrode 191 may be connected to the drain electrode of the transistor TFT.

[0073] An isolator 350 defining an opening 355 is disposed on the first electrode 191. A second electrode 270 is disposed on the isolator 350, and a light-emitting element layer 370 is disposed between the first electrode 191 and the second electrode 270. The first electrode 191, the second electrode 270, and the light-emitting element layer 370 are collectively referred to as a light-emitting element (LED).

[0074] refer to Figure 1 The insulating layer 180 includes a first region A1, a second region A2, and a third region A3.

[0075] The first region A1 and the third region A3 may have different heights from each other. Herein, the term "height" of a region of the insulating layer 180 refers to the distance from the top of that region to the first substrate 110 in the thickness direction of the first substrate 110. The first region A1 may have a smaller thickness than the third region A3. In this embodiment, the top of the first region A1 is positioned closer to the first substrate 110 than the top of the third region A3. The second region A2 is the portion connecting the first region A1 and the third region A3 and has a sloping surface.

[0076] refer to Figure 1 The first electrode 191 is configured to overlap with the first region A1, the second region A2, and the third region A3 in a direction perpendicular to the first substrate 110. In this embodiment, the entire portion of the first region A1 overlaps with the first electrode 191.

[0077] The spacer 350 overlaps with a portion of the first region A1, the second region A2, and the third region A3. The spacer 350 may have an inclined surface similar to that of the second region A2.

[0078] The light-emitting element layer 370 is configured to overlap with the first region A1 and the second region A2 in a direction perpendicular to the first substrate 110. The light-emitting element layer 370 may be disposed along the inclined surface of the second region A2.

[0079] The second electrode 270 is configured to overlap with the first region A1, the second region A2 and the third region A3 in a direction perpendicular to the first substrate 110.

[0080] In this embodiment, as described above, the light-emitting element LED is configured to overlap with a first region A1 with a smaller thickness and a second region A2 with an inclined surface of the insulating layer 180, such that light emitted to the side surface of the light-emitting element layer 370 is reflected by the first electrode 191, thereby increasing the light emission efficiency.

[0081] In an exemplary embodiment of the display device, the spacer 350 comprises an inorganic material. The spacer 350 may include an inorganic material comprising silicon. In one exemplary embodiment, for example, the spacer 350 may include materials selected from SiO2. xSiN x SiO x N y And at least one of the materials in siloxanes. In SiO x and SiN x In this context, x can be 1 to 4. In SiO₂ x N y In this context, x and y can be 1 to 5, respectively. In an exemplary embodiment, the separator 350 may further include carbon in an inorganic material comprising silicon (Si).

[0082] When the spacer 350 comprises an inorganic material containing silicon (Si), the absorption of light at lower wavelengths is relatively low compared to when the spacer 350 comprises an organic material. In this embodiment, the spacer 350 comprises an inorganic material with low light absorption, such that the amount of light reflected from the first electrode 191 located in the second region A2 is reduced by the spacer 350 and the amount transmitted is increased, thereby improving the light emission efficiency.

[0083] In an exemplary embodiment, the refractive index of the spacer 350 may be similar to that of the light-emitting element layer 370. In one exemplary embodiment, for example, the refractive index difference between the spacer 350 and the light-emitting element layer 370 may be less than about 50% of the refractive index of the spacer 350. In this embodiment, as described above, where the refractive index of the spacer 350 is similar to that of the light-emitting element layer 370, light reflected from the first electrode 191 can easily escape from the interface between the spacer 350 and the light-emitting element layer 370. If the refractive index difference between the spacer 350 and the light-emitting element layer 370 is large, total internal reflection can occur at the interface. Moreover, as the refractive index difference increases, it becomes more difficult for light to escape from the spacer 350.

[0084] In the case where the separator 350 includes an organic material, even if the insulating layer 180 has such Figure 1 The stepped structure shown in the diagram means that light reflected from the inclined surface of the first electrode 191 is also absorbed by the insulator 350 as it passes through it, thus the luminous efficiency may not be sufficiently increased. Specifically, when the light-emitting element layer 370 emits blue light, absorption is high at the insulator 350, which includes organic material. Therefore, in the case of a color-conversion display device in which the light-emitting element layer 370 emits blue light (which is subsequently converted into red and green light by a color conversion panel), simply forming the inclined surface of the insulating layer 180 may not be entirely effective in increasing the light emission efficiency.

[0085] In an exemplary embodiment of the display device, the insulating layer 180 includes a first region A1 with a thin thickness, a second region A2 with an inclined surface, and a third region A3 that is thicker than the first region A1, and the separator 350 comprises an inorganic material. Accordingly, the light emission efficiency can be increased by reflecting light emitted to the side surface of the light-emitting element layer 370 via a first electrode 191 placed in the second region A2, and the light emission efficiency can be increased by reducing the amount of light absorbed by the separator 350.

[0086] In an alternative exemplary embodiment, the separator 350 may include an organic material. In this embodiment, the separator 350 may include both organic and inorganic materials, or may include only organic materials. In an exemplary embodiment, where the separator 350 includes only organic materials, the light emission efficiency can be increased by the inclined surface of the insulating layer 180.

[0087] Figure 2 To illustrate polyimide (“PI”) as an organic material, siloxane as an inorganic material, and SiN x The graph shows the refractive index and extinction coefficient. Figure 2 Displays the refractive index and extinction coefficient relative to the wavelength of light (nm).

[0088] refer to Figure 2 It can be shown that, compared with polyimide as an organic material, SiN as an inorganic material... x Siloxanes and other siloxanes have lower extinction coefficients. In this embodiment, it can be confirmed that SiN... x It has a low extinction coefficient, and the difference in extinction coefficient between it and polyimide is significant in the short wavelength region. Therefore, in blue light-emitting elements, when the insulator is made of SiN... x During formation, the absorption of reflected light by the isolator can be minimized.

[0089] Return to reference Figure 1 The lowermost surface of the second electrode 270 may be configured to be lower than the uppermost surface of the separator 350. The lowermost surface of the second electrode 270 is disposed within the opening 355 of the separator 350. That is, the lowermost surface of the second electrode 270 is configured to be closer to the first substrate 110 than the uppermost surface of the separator 350.

[0090] Therefore, most of the light emitted from the light-emitting element layer 370 between the first electrode 191 and the second electrode 270 is reflected at the top surface and the side-tilted surface of the first electrode 191 to maximize the light emission efficiency.

[0091] In an exemplary embodiment of the present invention, because the separator 350 comprises an inorganic material, the separator 350 can be formed on the first electrode 191 and the insulating layer 180 with a uniform thickness. Although Figure 1 The thickness of the spacer 350 varies slightly from region to region, but this is a modification to illustrate the characteristics of the invention, and the actual thickness of the spacer 350 can be uniform.

[0092] Because the spacer 350 comprises an inorganic material, it is also possible to form a thin spacer 350. In one exemplary embodiment, for example, the thickness of the spacer 350 may be approximately [missing information]. to approximately Within the range.

[0093] The first electrode 191 is a reflective electrode and may be a multilayer comprising a transparent conductive oxide layer and a metal layer. In an exemplary embodiment, for example, the first electrode 191 may have a three-layer structure of ITO / Ag / ITO.

[0094] Figure 3 A cross-sectional view showing a display device according to an alternative exemplary embodiment of the present invention. Figure 3 The exemplary embodiments of the display device shown in the above reference are similar. Figure 1 The exemplary embodiments described are substantially the same, except for the height relationship between the separator 350 and the second electrode 270. Figure 3 The same or similar elements shown in the text have been used in the description above. Figure 1 The exemplary embodiments of the display device shown herein are labeled with the same reference numerals, and any repeated detailed descriptions thereof will be omitted or simplified below.

[0095] refer to Figure 3 The upper surface of the isolator 350 and the lower surface of the second electrode 270 can be disposed at the same height or horizontal level as the upper surface of the first substrate 110. In this embodiment, the upper surface of the isolator 350 adjacent to the opening 355 of the isolator 350 and the lower surface of the second electrode 270 disposed in the opening 355 can be disposed on an imaginary horizontal line or plane parallel to the first substrate 110. In this embodiment, in which the upper surface of the isolator 350 and the lower surface of the second electrode 270 are disposed at the same height as each other, most of the light emitted from the light-emitting element layer 370 disposed between the first electrode 191 and the second electrode 270 is reflected by the inclined surface and the upper surface of the first electrode 191, thereby increasing the luminous efficiency.

[0096] Figure 4 A cross-sectional view of a display device according to another alternative exemplary embodiment of the present invention. Figure 4 The exemplary embodiments of the display device shown in the above reference are similar. Figure 1 The exemplary embodiments described are substantially the same, except for the height relationship between the separator 350 and the second electrode 270. Figure 4The same or similar elements shown in the text have been used in the description above. Figure 1 The exemplary embodiments of the display device shown herein are labeled with the same reference numerals, and any repeated detailed descriptions thereof will be omitted or simplified below.

[0097] refer to Figure 4 The second electrode 270 is not disposed within the opening 355 of the separator 350. That is, the lowermost surface of the second electrode 270 in the first region A1 is disposed above the uppermost surface of the separator 350, or further away from the first substrate 110 than the uppermost surface of the separator 350. This structure can be formed when the separator 350, comprising inorganic material, is formed thin and the light-emitting element layer 370 is formed thick. Figure 4 In the embodiment shown, most of the light emitted laterally from the light-emitting element layer 370 disposed between the first electrode 191 and the second electrode 270 is reflected by the inclined surface of the first electrode 191, thereby improving the light emission efficiency.

[0098] In an exemplary embodiment, as described above, the display device includes a first region A1 and a third region A3 in which insulating layers 180 have different heights from each other, and a second region A2 having an inclined surface connecting the first region A1 and the third region A3. A first electrode 191 is disposed along the inclined surface of the second region A2, and light emitted to the side surface of the light-emitting element layer 370 is reflected from the side of the first electrode 191, thereby increasing luminous efficiency. In this embodiment, the insulator 350 comprises an inorganic material, such that light emission efficiency can be improved by increasing the transmittance of light reflected from the first electrode 191. In this embodiment, the insulator 350 may have a refractive index similar to that of the light-emitting element layer 370, and light can easily exit the interface between the insulator 350 and the light-emitting element layer 370, thereby increasing light emission efficiency.

[0099] Next, a display device according to another alternative exemplary embodiment of the present invention will be described. Figure 5 A cross-sectional view of a display device according to another alternative exemplary embodiment of the present invention. Figure 5 The exemplary embodiments of the display device shown in the above reference are similar. Figure 1 The exemplary embodiments of the described display device are substantially the same, except for the construction of the insulating layer 180 and the reflective member 410. Figure 5 The same or similar elements shown in the text have been used in the description above. Figure 1 The exemplary embodiments of the display device shown herein are labeled with the same reference numerals, and any repeated detailed descriptions thereof will be omitted or simplified below.

[0100] refer to Figure 5In an exemplary embodiment of the display device, the insulating layer 180 has a substantially constant height or thickness, without a first region and a second region having different heights or thicknesses from each other. In this embodiment, the insulating layer 180 may have a flat upper surface. In this embodiment, the display device includes a reflective member 410 disposed between the insulating layer 180 and the first electrode 191.

[0101] The side surface of the reflective member 410 may be inclined. The first electrode 191 may be disposed on the upper surface and the inclined side surface of the reflective member 410. In this embodiment, because the first electrode 191 has an inclined side surface corresponding to the side surface of the reflective member 410, light emitted to the side surface of the light-emitting element layer 370 can be reflected by the first electrode 191 and the reflective member 410, thereby increasing the light emission efficiency.

[0102] The reflective member 410 may comprise a metal. The reflective member 410 may have a single-layer or multi-layer structure. In one exemplary embodiment, for example, the reflective member 410 may have a Ti / Al / Ti or Mo / Al / Mo three-layer structure. Alternatively, the reflective member 410 may have a Ti / Cu two-layer structure. However, the material of the reflective member 410 is not limited to the above materials, and any metal with reflective properties can be used without limitation.

[0103] In an exemplary implementation, such as Figure 5 As shown, when viewed in a cross-sectional view perpendicular to the first substrate 110, the reflective member 410 may be trapezoidal in shape, but its shape is not limited to this. In an exemplary embodiment, the shape of the reflective member 410 is not limited, as long as the side surface of the region adjacent to the opening 355 of the spacer 350 includes an inclined surface. Alternatively, when viewed in a cross-sectional view perpendicular to the first substrate 110, the reflective member 410 may be triangular or quadrilateral, including only one inclined surface.

[0104] In this embodiment, the spacer 350 may comprise an organic or inorganic material. In one exemplary embodiment, for example, the spacer 350 may comprise an inorganic material containing Si. The spacer 350 may comprise materials selected from SiO2. x SiN x SiO x N y And at least one of the materials selected from siloxanes. In this embodiment, the separator 350 may further include carbon in the silicon-containing inorganic material.

[0105] When the spacer 350 comprises an inorganic material containing Si, the absorption of lower wavelength light is relatively low compared to when the spacer 350 comprises an organic material. In an exemplary embodiment where the spacer 350 comprises an inorganic material with low light absorption, the amount of light reflected from the reflective member 410 is absorbed into the spacer 350, thereby increasing the light emission efficiency.

[0106] The refractive index of the spacer 350 may be similar to that of the light-emitting element layer 370. In one exemplary embodiment, for example, the difference between the refractive indices of the spacer 350 and the light-emitting element layer 370 may be about 50% or less. In the exemplary embodiment, as described above, when the refractive index of the spacer 350 is similar to that of the light-emitting element layer 370, light reflected from the reflective member 410 can easily exit the interface between the spacer 350 and the light-emitting element layer 370.

[0107] Figure 6 A cross-sectional view of a display device according to another alternative exemplary embodiment of the present invention. Figure 6 The exemplary embodiments of the display device shown in the above reference are similar. Figure 5 The exemplary embodiments described are substantially the same, except for the height relationship between the separator 350 and the second electrode 270. Figure 6 The same or similar elements shown in the text have been used in the description above. Figure 5 The exemplary embodiments of the display device shown herein are labeled with the same reference numerals, and any repeated detailed descriptions thereof will be omitted or simplified below.

[0108] refer to Figure 6 In an exemplary embodiment, the upper surface of the spacer 350 and the lower surface of the second electrode 270 may be disposed at the same height or horizontal level as the upper surface of the first substrate 110. In this embodiment, the upper surface of the spacer 350 adjacent to the opening 355 of the spacer 350 and the lower surface of the second electrode 270 disposed in the opening 355 may be disposed on an imaginary horizontal line or plane parallel to the first substrate 110. In this embodiment, in which the upper surface of the spacer 350 and the lower surface of the second electrode 270 are disposed at the same height as each other, most of the light emitted from the light-emitting element layer 370 disposed between the first electrode 191 and the second electrode 270 to the side surface is reflected by the inclined surface of the reflective member 410, thereby increasing the luminous efficiency.

[0109] Figure 7 A cross-sectional view of a display device according to another alternative exemplary embodiment of the present invention. Figure 7 The exemplary embodiments of the display device shown in the above reference are similar. Figure 5The exemplary embodiments described are substantially the same, except for the height relationship between the separator 350 and the second electrode 270. Figure 7 The same or similar elements shown in the text have been used in the description above. Figure 5 The exemplary embodiments of the display device shown herein are labeled with the same reference numerals, and any repeated detailed descriptions thereof will be omitted or simplified below.

[0110] refer to Figure 7 In an exemplary embodiment, the second electrode 270 is not disposed within the opening 355 of the separator 350. In this embodiment, the lowermost surface of the second electrode 270, which overlaps with the opening 355 of the separator 350, is disposed above the uppermost surface of the separator 350, or further away from the first substrate 110 than the uppermost surface of the separator 350. Figure 7 In the embodiment shown, most of the light emitted laterally from the light-emitting element layer 370 disposed between the first electrode 191 and the second electrode 270 is reflected by the inclined surface of the reflective member 410, thereby improving the light emission efficiency.

[0111] Figure 8 This is a cross-sectional view of a display device according to another alternative exemplary embodiment. Figure 8 The exemplary embodiments of the display device shown in the above reference are similar. Figure 1 The exemplary embodiments of the described display device are substantially the same, except for the construction of the insulating layer 180 and the reflective member 410. Figure 8 The same or similar elements shown in the text have been used in the description above. Figure 1 The exemplary embodiments of the display device shown herein are labeled with the same reference numerals, and any repeated detailed descriptions thereof will be omitted or simplified below.

[0112] refer to Figure 8 In an exemplary embodiment of the display device, the insulating layer 180 has substantially the same height or substantially constant thickness, without a first region and a second region having different heights from each other. In this embodiment, as... Figure 8 As shown in the image, the display device includes a reflective member 410 disposed on the first electrode 191.

[0113] The side surface of the reflective member 410 may be inclined. Light emitted to the side surface of the light-emitting element layer 370 is reflected by the reflective member 410, thereby increasing the light emission efficiency.

[0114] The reflective member 410 may comprise a metal. The reflective member 410 may have a single-layer or multi-layer structure. In one exemplary embodiment, for example, the reflective member 410 may have a Ti / Al / Ti or Mo / Al / Mo three-layer structure. Alternatively, the reflective member 410 may have a Ti / Cu two-layer structure. However, the material of the reflective member 410 is not limited to the above materials, and any metal with reflective properties can be used without limitation.

[0115] refer to Figure 8 In an exemplary embodiment, one edge of the reflective member 410 and one edge of the first electrode 191 may be disposed on the same plane. In this embodiment, one side surface of the reflective member 410 and one side surface of the first electrode 191 are aligned with each other to form the same inclined surface. This structure can be formed when the reflective member 410 and the first electrode 191 are formed in a single process using a halftone mask. In this embodiment, as... Figure 8 As shown, the side surface of the reflective member 410 and the side surface of the first electrode 191 can be disposed on the same plane.

[0116] In an exemplary embodiment, the spacer 350 may comprise an organic or inorganic material. The spacer 350 may comprise an inorganic material containing Si. In one exemplary embodiment, for example, the spacer 350 may comprise a material selected from SiO2. x SiN x SiO x N y And at least one of the materials selected from siloxanes. In this embodiment, the separator 350 may further include carbon in the silicon-containing inorganic material.

[0117] When the spacer 350 comprises an inorganic material containing Si, the absorption of low-wavelength light is relatively low compared to when the spacer 350 comprises an organic material. In an exemplary embodiment, the spacer 350 comprises an inorganic material with low light absorption, such that the amount of light reflected from the reflective member 410 is absorbed by the spacer 350 is reduced, thereby improving light emission efficiency.

[0118] The refractive index of the spacer 350 may be similar to that of the light-emitting element layer 370. In one exemplary embodiment, for example, the refractive index difference between the spacer 350 and the light-emitting element layer 370 may be about 50% or less. In this embodiment, as described above, the refractive index of the spacer 350 is similar to that of the light-emitting element layer 370, such that light reflected from the reflective member 410 can easily exit the interface between the spacer 350 and the light-emitting element layer 370.

[0119] Figure 9A cross-sectional view of a display device according to another alternative exemplary embodiment of the present invention. Figure 9 The exemplary embodiments of the display device shown in the above reference are similar. Figure 8 The exemplary embodiments described are substantially the same, except for the height relationship between the separator 350 and the second electrode 270. Figure 9 The same or similar elements shown in the text have been used in the description above. Figure 8 The exemplary embodiments of the display device shown herein are labeled with the same reference numerals, and any repeated detailed descriptions thereof will be omitted or simplified below.

[0120] refer to Figure 9 In an exemplary embodiment, the upper surface of the spacer 350 and the lower surface of the second electrode 270 may be disposed at the same height or horizontal level as the upper surface of the first substrate 110. In this embodiment, the upper surface of the spacer 350 adjacent to the opening 355 of the spacer 350 and the lower surface of the second electrode 270 disposed at the opening 355 may be disposed on an imaginary horizontal line or plane parallel to the first substrate 110. In this embodiment, in which the upper surface of the spacer 350 and the lower surface of the second electrode 270 are disposed at the same height as each other, most of the light emitted laterally from the light-emitting element layer 370 disposed between the first electrode 191 and the second electrode 270 is reflected by the inclined surface of the reflective member 410, thereby increasing the luminous efficiency.

[0121] Figure 10 A cross-sectional view of a display device according to another alternative exemplary embodiment of the present invention. Figure 10 The exemplary embodiments of the display device shown in the above reference are similar. Figure 8 The exemplary embodiments described are substantially the same, except for the height relationship between the separator 350 and the second electrode 270. Figure 10 The same or similar elements shown in the text have been used in the description above. Figure 8 The exemplary embodiments of the display device shown herein are labeled with the same reference numerals, and any repeated detailed descriptions thereof will be omitted or simplified below.

[0122] refer to Figure 10 In an exemplary embodiment, the second electrode 270 is not disposed within the opening 355 of the separator 350. In this embodiment, the lowermost surface of the second electrode 270, which overlaps with the opening 355 of the separator 350, is disposed above the uppermost surface of the separator 350, or further away from the first substrate 110 than the uppermost surface of the separator 350. Figure 10In the embodiment shown, most of the light emitted laterally from the light-emitting element layer 370 disposed between the first electrode 191 and the second electrode 270 is reflected by the inclined surface of the reflective member 410, thereby improving the light emission efficiency.

[0123] Figure 11 A cross-sectional view of a display device according to another alternative exemplary embodiment of the present invention. Figure 11 The exemplary embodiments of the display device shown in the above reference are similar. Figure 8 The exemplary embodiments described are substantially the same, except for the construction of the reflective member 410 and the first electrode 191. Figure 11 The same or similar elements shown in the text have been used in the description above. Figure 8 The exemplary embodiments of the display device shown herein are labeled with the same reference numerals, and any repeated detailed descriptions thereof will be omitted or simplified below.

[0124] refer to Figure 11 In an exemplary embodiment of the display device, the edge of the side surface of the reflective member 410 is not aligned with the edge of the side surface of the first electrode 191. In this embodiment, as... Figure 11 As shown, the reflective member 410 includes a region that does not overlap with the first electrode 191 in a direction perpendicular to the first substrate 110 or in the thickness direction of the first substrate 110. This structure can be formed when the first electrode 191 and the reflective member 410 are formed in separate processes.

[0125] In this embodiment, the reflective member 410 is in relation to the reference above. Figure 8 The described reflective member 410 is substantially the same. In this embodiment, the side surface of the reflective member 410 may be inclined. Light emitted to the side surface of the light-emitting element layer 370 can be reflected by the reflective member 410 to increase light emission efficiency. The reflective member 410 may include a metal. The reflective member 410 may have a single-layer structure or a multi-layer structure. In an exemplary embodiment, for example, the reflective member 410 may have a Ti / Al / Ti or Mo / Al / Mo three-layer structure. Alternatively, the reflective member 410 may have a Ti / Cu two-layer structure. However, the material of the reflective member 410 is not limited to the above-described materials, and any metal with reflective properties can be used without limitation.

[0126] In this implementation, the spacer 350 is related to the above reference. Figure 8 The described separator 350 is substantially the same. In this embodiment, separator 350 may comprise an organic or inorganic material. Separator 350 may comprise an inorganic material containing silicon. In an exemplary embodiment, for example, separator 350 may comprise a material selected from SiO2. x SiN xSiO x N y And at least one of siloxanes. In this embodiment, the separator 350 may further include carbon in the silicon-containing inorganic material.

[0127] When the spacer 350 comprises an inorganic material containing Si, the absorption of lower wavelength light is relatively low compared to when the spacer 350 comprises an organic material. In an exemplary embodiment, the spacer 350 comprises an inorganic material with low light absorption, such that the amount of light reflected from the reflective member 410 is absorbed into the spacer 350, thereby increasing the light emission efficiency.

[0128] The refractive index of the spacer 350 may be similar to that of the light-emitting element layer 370. In one exemplary embodiment, for example, the refractive index difference between the spacer 350 and the light-emitting element layer 370 may be about 50% or less. In this embodiment, as described above, the refractive index of the spacer 350 is similar to that of the light-emitting element layer 370, such that light reflected from the reflective member 410 can easily exit the interface between the spacer 350 and the light-emitting element layer 370.

[0129] Figure 12 A cross-sectional view showing a display device according to another alternative exemplary embodiment of the present invention. (Reference) Figure 12 The display device according to the exemplary embodiment and Figure 11 The display device is the same as that of the exemplary embodiment, except for the height relationship between the isolator 350 and the second electrode 270. Figure 12 The same or similar elements shown in the text have been used in the description above. Figure 11 The exemplary embodiments of the display device shown herein are labeled with the same reference numerals, and any repeated detailed descriptions thereof will be omitted or simplified below.

[0130] refer to Figure 12 In an exemplary embodiment, the upper surface of the spacer 350 and the lower surface of the second electrode 270 may be disposed at the same height or horizontal level as the upper surface of the first substrate 110. In this embodiment, the upper surface of the spacer 350 adjacent to the opening 355 of the spacer 350 and the lower surface of the second electrode 270 disposed at the opening 355 may be placed on an imaginary horizontal line or plane parallel to the first substrate 110. In this embodiment, where the upper surface of the spacer 350 and the lower surface of the second electrode 270 are disposed at the same height as each other, most of the light emitted from the light-emitting element layer 370 disposed between the first electrode 191 and the second electrode 270 to the side surface is reflected by the inclined surface of the reflective member 410, thereby increasing the luminous efficiency.

[0131] Figure 13A cross-sectional view of a display device according to another alternative exemplary embodiment of the present invention. Figure 13 The exemplary embodiments of the display device shown in the above reference are similar. Figure 11 The display devices described in the exemplary embodiments are substantially the same, except for the height relationship between the separator 350 and the second electrode 270. Figure 13 The same or similar elements shown in the text have been used in the description above. Figure 11 The exemplary embodiments of the display device shown herein are labeled with the same reference numerals, and any repeated detailed descriptions thereof will be omitted or simplified below.

[0132] refer to Figure 13 In an exemplary embodiment, the second electrode 270 is not disposed within the opening 355 of the separator 350. In this embodiment, the lowermost surface of the second electrode 270, which overlaps with the opening 355, is disposed above or further away from the uppermost surface of the separator 350 from the first substrate 110. Figure 13 In the embodiment shown, most of the light emitted laterally from the light-emitting element layer 370 disposed between the first electrode 191 and the second electrode 270 is reflected by the inclined surface of the reflective member 410, thereby improving the light emission efficiency.

[0133] The following text will refer to Figure 14 Another alternative exemplary embodiment of the display device according to the present invention is described.

[0134] Figure 14 A cross-sectional view showing a display device according to another alternative exemplary embodiment of the present invention. (Reference) Figure 14 An exemplary embodiment of the display device includes a display substrate 100 and a color conversion substrate 300.

[0135] The display substrate 100 includes a first substrate 110, a plurality of transistor TFTs disposed on the first substrate 110, and an insulating layer 180. A first electrode 191 and an isolator 350 are disposed on the insulating layer 180, and the first electrode 191 is disposed in an opening 355 of the isolator 350 and connected to the transistor TFT. A second electrode 270 is disposed on the isolator 350, and a light-emitting element layer 370 is disposed between the first electrode 191 and the second electrode 270. The first electrode 191, the second electrode 270, and the light-emitting element layer 370 are collectively referred to as light-emitting elements (LEDs).

[0136] In this embodiment, the insulating layer 180 and the light-emitting element LED are the same as those described above. In this embodiment, the insulating layer 180 includes a first region A1, a third region A3 configured to be higher than the first region A1, and a second region A2 having an inclined surface connecting the first region A1 and the third region A3.

[0137] The first electrode 191, disposed in the second region A2, reflects light emitted from the light-emitting element layer 370 to the side surface, thereby increasing the light emission efficiency. In this embodiment, the separator 350 comprises an inorganic material, and particularly an inorganic material containing Si, such that light reflected from the first electrode 191 is effectively transmitted, thereby increasing the light emission efficiency.

[0138] exist Figure 14 In the middle, the display substrate 100 has corresponding Figure 1 The structure of the display substrate 100 is not limited to the structure shown in the image, and the display substrate 100 can be modified in various ways to have different structures. Figure 3 and Figure 4 , Figures 5 to 7 , Figures 8 to 10 or Figures 11 to 13 Any structure of the exemplary implementation shown in the figure.

[0139] The light-emitting element layer 370 can emit blue light. In this embodiment, the blue light-emitting element LED has the above reference. Figure 1 , Figure 3 , Figure 4 and Figures 5 to 13 Any structure described herein can increase the light emission efficiency of blue light as described above.

[0140] A light-blocking member 220 is disposed on the second substrate 210. The light-blocking member 220 may be configured to overlap with the spacer 350 of the first substrate 110.

[0141] Multiple color filters 230R, 230G, and 230B are disposed between light-blocking components 220. Each of the color filters 230R, 230G, and 230B is disposed between two adjacent light-blocking components 220.

[0142] A color filter insulating layer 250 is disposed on color filters 230R, 230G, and 230B, and on the light-blocking member 220. Color conversion layers 330R and 330G, and a transmission layer 330B are disposed on the color filter insulating layer 250. In an exemplary embodiment, the color filter insulating layer 250 is disposed between the color conversion layers 330R and 330G, and the transmission layer 330B, and the color filters 230R, 230G, and 230B. The color conversion layers 330R and 330G, and the transmission layer 330B may be configured to overlap with the color filters 230R, 230G, and 230B, respectively.

[0143] Color conversion layers 330R and 330G include quantum dots and convert incident light into different colors of light. Color conversion layers 330R and 330G include a green color conversion layer 330G and a red color conversion layer 330R that convert blue light emitted from the light-emitting element layer 370 into green light and red light, respectively. Transmission layer 330B transmits blue light as is.

[0144] The planarization layer 351 can be placed on the color conversion layers 330R and 330G and the transmission layer 330B.

[0145] In an exemplary embodiment, the display device includes a display substrate 100 and a color conversion substrate 300, and light emitted from the display substrate 100 is emitted to the outside through color filters 230R, 230G and 230B after passing through the color conversion layers 330R and 330G or the transmission layer 330B of the color conversion substrate 300.

[0146] In an exemplary embodiment of the display device, the insulating layer 180 has a similar shape to... Figure 1 , Figure 3 and Figure 4 The same structure, or further including such structures Figures 5 to 13 The displayed reflective member 410 thus has improved light emission efficiency. In this embodiment, the separator 350 may include an inorganic material containing Si, such that when the light-emitting element layer 370 emits blue light, the transmittance of blue light is high, thereby effectively improving the light emission efficiency.

[0147] Next, we will refer to Figure 15 and Figure 16 The detailed structure of a display device according to an exemplary embodiment of the present invention is described below. However, this is only exemplary, and the structure of the present invention is not limited thereto.

[0148] Figure 15 A top view of a display panel according to an exemplary embodiment of the present invention is shown for illustrative purposes. Figure 16 For along Figure 15 A cross-sectional view taken from line XVI-XVI'.

[0149] In an exemplary implementation, such as Figure 15 and Figure 16As shown, the display panel can be an active matrix (“AM”) type light-emitting diode display with a two-transistor-one-capacitor (“2Tr-1Cap”) structure (including two thin-film transistors T1 and T2 and a single capacitor element C1 in each pixel of the display area), but the invention and exemplary embodiments are not limited thereto. Alternatively, the light-emitting diode display may provide three or more transistors and two or more capacitor elements in one pixel, and may further provide separate wiring for a differently modified structure. Here, a pixel is the basic or smallest unit for displaying an image, and the display area displays an image through multiple pixels.

[0150] refer to Figure 15 and Figure 16 An exemplary embodiment of a light-emitting diode (LED) display includes a switching thin-film transistor (TFT) T1, a driving TFT T2, a capacitor element C1, and a light-emitting element (LED), which are formed in a plurality of pixels disposed on a first substrate 110. In this embodiment, a gate line 121 is disposed on the first substrate 110 along one direction, and a data line 171 and a common power line 172 intersecting the gate line 121 and insulated from it are disposed on the first substrate 110. In one exemplary embodiment, for example, each pixel may be defined by the boundaries of the gate line 121, the data line 171, and the common power line 172, but is not limited thereto.

[0151] The light-emitting element LED includes a first electrode 191, a light-emitting element layer 370 disposed on the first electrode 191, and a second electrode 270 disposed on the light-emitting element layer 370.

[0152] In this embodiment, the first electrode 191 may be an anode serving as a hole injection electrode, and the second electrode 270 may be a cathode serving as an electron injection electrode. However, the invention is not limited thereto, and alternatively, according to the driving method of a light-emitting diode display, the first electrode 191 may be a cathode and the second electrode 270 may be an anode. In an exemplary embodiment, the first electrode 191 may be referred to as a pixel electrode and the second electrode 270 may be referred to as a common electrode.

[0153] The light-emitting element layer 370 may include an emitting layer and at least one layer selected from a hole injection layer, a hole transport layer, an electron transport layer, and an electron injection layer. In this embodiment, the emitting layer may include an organic emitting layer and emits light when excitons generated by the recombination of injected holes and electrons descend from an excited state to a ground state. Alternatively, the emitting layer may include a quantum dot.

[0154] Capacitor element C1 includes a pair of capacitor plates 158c and 178c, which are disposed via an interlayer insulating layer 160 inserted between them. Here, the interlayer insulating layer 160 comprises a dielectric material. The capacitance is determined by the charge accumulated in capacitor element C1 and the voltage between the pair of capacitor plates 158c and 178c.

[0155] The switching thin-film transistor T1 includes a switching semiconductor layer 137, a switching gate electrode 122, a switching source electrode 176s, and a switching drain electrode 177d. The driving thin-film transistor T2 includes a driving semiconductor layer 131, a driving gate electrode 124, a driving source electrode 173s, and a driving drain electrode 175d.

[0156] A switching thin-film transistor T1 is used as a switching element to select the pixel from which it emits light. A switching gate electrode 122 is connected to gate line 121, and a switching source electrode 176s is connected to data line 171. A switching drain electrode 177d is configured to be separate from the switching source electrode 176s and connected to a capacitor plate 158c.

[0157] The driving thin-film transistor T2 applies driving power to emit the light-emitting element layer 370 of the light-emitting element LED within the selected pixel to the first electrode 191. The driving gate electrode 124 is connected to the capacitor plate 158c (which is connected to the switching drain electrode 177d). The driving source electrode 173s and another capacitor plate 178c are connected to the common power line 172.

[0158] The drive drain electrode 175d is connected to the first electrode 191 through a contact hole 185 defined or formed in the insulating layer 180.

[0159] In an exemplary implementation, such as Figure 15 and Figure 16 The display panel can be an organic light-emitting diode display, but is not limited to this.

[0160] A buffer layer 120 is disposed on a first substrate 110. The first substrate 110 may include or be made of at least one material selected from glass, quartz, ceramics, and plastics. The buffer layer 120 may include or be formed of a material selected from silicon nitride (SiN). x ), silicon dioxide (SiO2) and silicon oxynitride (SiO2) x N y It may contain at least one of the following materials, but is not limited thereto:

[0161] A driving semiconductor layer 131 is disposed on the buffer layer 120. The driving semiconductor layer 131 may include or be formed of at least one of various semiconductor materials (such as polycrystalline silicon film and amorphous silicon film). The driving semiconductor layer 131 may include a source region 133, a channel region 134, and a drain region 135.

[0162] A gate insulating layer 140, comprising silicon nitride or silicon oxide or made of silicon nitride or silicon oxide, is disposed on the driving semiconductor layer 131. A driving gate electrode 124 and a first capacitor plate 158c are disposed on the gate insulating layer 140. In this embodiment, the driving gate electrode 124 is configured to overlap with at least a portion of the driving semiconductor layer 131 (specifically, the channel region 134).

[0163] An interlayer insulating layer 160 covering the driving gate electrode 124 is disposed on the gate insulating layer 140. The interlayer insulating layer 160 may include or be formed of silicon nitride or silicon oxide, as with the gate insulating layer 140. A first contact hole 163 and a second contact hole 165 may be defined by the gate insulating layer 140 and the interlayer insulating layer 160, respectively, to expose the source region 133 and the drain region 135 of the driving semiconductor layer 131.

[0164] The driving source electrode 173s, the driving drain electrode 175d, the data line 171, the common power line 172, and the second capacitor plate 178c are disposed on the interlayer insulating layer 160. The driving source electrode 173s and the driving drain electrode 175d are connected to the source region 133 and the drain region 135 of the driving semiconductor layer 131 through the first contact hole 163 and the second contact hole 165, respectively.

[0165] An insulating layer 180 covering the driving source electrode 173s and the driving drain electrode 175d is disposed on the interlayer insulating layer 160. The insulating layer 180 may include organic materials, such as polyacrylic acid series or polyimide series.

[0166] A spacer 350 is disposed on the insulating layer 180, and an opening 355 is defined by removing a portion of the spacer 350. In the opening 355, a light-emitting element layer 370 is configured to overlap with a first electrode 191, and a second electrode 270 is configured to overlap with the light-emitting element layer 370. The light-emitting element layer 370 may include an emitting layer and at least one selected from a hole injection layer, a hole transport layer, an electron transport layer, and an electron injection layer. The second electrode 270 may be a common electrode. The light-emitting element LED includes the first electrode 191, the light-emitting element layer 370, and the second electrode 270.

[0167] In an exemplary embodiment, the separator 350 may comprise an organic or inorganic material. The separator 350 may comprise an inorganic material containing silicon. In one exemplary embodiment, for example, the separator 350 may comprise a material selected from SiO2. x SiN x SiO x N y And at least one of the materials selected from siloxanes. In an exemplary embodiment, the separator 350 may further include carbon in the silicon-containing inorganic material.

[0168] refer to Figure 16 The insulating layer 180 includes a first region A1, a second region A2, and a third region A3. The first region A1 has a smaller thickness than the third region A3. In this embodiment, the top surface of the first region A1 is positioned closer to the first substrate 110 than the top surface of the third region A3. The second region A2 has an inclined surface that serves as a connection between the first region A1 and the third region A3. A first electrode 191 is disposed on the inclined surface of the second region A2, and the first electrode 191 reflects light emitted from the light-emitting element layer 370 to the side surface to increase light emission efficiency.

[0169] Figure 16 This implementation method can be as follows: Figure 1 The exemplary implementation also has improved light emission efficiency. Figure 16 In an exemplary embodiment, the spacer 350 may include an inorganic material comprising Si.

[0170] Figure 17 A cross-sectional view of a display device according to an alternative exemplary embodiment is shown. (Reference) Figure 17 An exemplary embodiment of the display device further includes a reflective member 410 disposed between the insulating layer 180 and the first electrode 191. Figure 17 The exemplary implementation may correspond to Figure 5 Exemplary implementations. Figure 17 The same or similar elements shown in the text have been used in the description above. Figure 5 The exemplary embodiments of the display device shown herein are labeled with the same reference numerals, and any repeated detailed descriptions thereof will be omitted or simplified below.

[0171] In an exemplary implementation, reference Figure 17 The side surface of the reflective member 410 may be inclined. The first electrode 191 may be disposed on the upper surface and the inclined side surface of the reflective member 410. Because the first electrode 191 has a side surface inclined along the side surface of the reflective member 410, such as... Figure 16 As in the case of light emission, light emitted to the side surface of the light-emitting element layer 370 is reflected by the reflective member 410 and the first electrode 191, thereby increasing the light emission efficiency.

[0172] Figure 18 A cross-sectional view of a display device according to another alternative exemplary embodiment. Reference Figure 18 An exemplary embodiment of the display device includes a reflective member 410 disposed on a first electrode 191. Figure 18 The exemplary implementation may correspond to Figure 8 Exemplary implementations. Figure 18The same or similar elements shown in the text have been used in the description above. Figure 8 The exemplary embodiments of the display device shown herein are labeled with the same reference numerals, and any repeated detailed descriptions thereof will be omitted or simplified below.

[0173] In an exemplary embodiment, the side surface of the reflective member 410 may be inclined. Light emitted to the side surface of the light-emitting element layer 370 is reflected by the reflective member 410 to increase light emission efficiency.

[0174] refer to Figure 18 One edge of the reflective member 410 and one edge of the first electrode 191 may be disposed on the same plane. In this embodiment, one side surface of the reflective member 410 and one side surface of the first electrode 191 may form the same inclined surface.

[0175] Figure 19 This is a cross-sectional view of a display device according to another alternative exemplary embodiment. Figure 19 The display device shown in the middle and Figure 18 The exemplary implementation is substantially the same, except for the alignment of the side surface edge of the reflective member 410 and the side surface edge of the first electrode 191. Figure 19 The same or similar elements shown in the text have been used in the description above. Figure 18 The exemplary embodiments of the display device shown herein are labeled with the same reference numerals, and any repeated detailed descriptions thereof will be omitted or simplified below.

[0176] Next, we will refer to Figures 20 to 25 The detailed structure of a display device according to another alternative exemplary embodiment of the present invention is described in detail. However, this is only exemplary, and the structure of the present invention is not limited thereto.

[0177] Figure 20 This is a circuit diagram for pixels used in a display device according to an exemplary embodiment.

[0178] refer to Figure 20 An exemplary embodiment of the display device may include multiple pixels, and each pixel may include multiple transistors T1, T2, and T3; a capacitor Cst; and at least one light-emitting diode ED. In an exemplary embodiment, such as Figure 20 As shown, for example, a pixel includes a single light-emitting diode (ED), but is not limited to this.

[0179] The plurality of transistors T1, T2, and T3 includes a first transistor T1, a second transistor T2, and a third transistor T3. The source and drain electrodes described below refer to two electrodes disposed on opposite sides of the channel of each of transistors T1, T2, and T3, and are interchangeable.

[0180] The gate electrode G1 of the first transistor T1 is connected to one terminal of the capacitor Cst, the source electrode S1 of the first transistor T1 is connected to the drive voltage line of the transmission drive voltage ELVDD, and the drain electrode D1 of the first transistor T1 is connected to the anode of the light-emitting diode ED and the other terminal of the capacitor Cst. The first transistor T1 receives the data voltage DAT according to the switching operation of the second transistor T2, and supplies the drive current corresponding to the voltage stored in the capacitor Cst to the light-emitting diode ED.

[0181] The gate electrode G2 of the second transistor T2 is connected to the first scan line that transmits the first scan signal SC. The source electrode S2 of the second transistor T2 is connected to the data line that transmits the data voltage DAT or the reference voltage. The drain electrode D2 of the second transistor T2 is connected to one terminal of the capacitor Cst and the gate electrode G1 of the first transistor T1. The second transistor T2 can be turned on in response to the first scan signal SC to transmit the reference voltage or the data voltage DAT to the gate electrode G1 of the first transistor T1 and one terminal of the capacitor Cst.

[0182] The gate electrode G3 of the third transistor T3 is connected to the scan line that transmits the second scan signal SS. The source electrode S3 of the third transistor T3 is connected to the other terminal of the capacitor Cst, the drain electrode D1 of the first transistor T1, and the anode of the light-emitting diode ED. The drain electrode D3 of the third transistor T3 is also connected to the initialization voltage line that transmits the initialization voltage INIT. The third transistor T3 can be turned on in response to the second scan signal SS to transmit the initialization voltage INIT to the anode of the light-emitting diode ED and the other terminal of the capacitor Cst, thereby initializing the voltage at the anode of the light-emitting diode (LED) ED.

[0183] One terminal of capacitor Cst is connected to the gate electrode G1 of the first transistor T1, and the other terminal of capacitor Cst is connected to the source electrode S3 of the third transistor T3 and the anode of the light-emitting diode ED. The cathode of the light-emitting diode ED is connected to the common voltage line that transmits the common voltage ELVSS.

[0184] The light-emitting diode ED can emit light corresponding to the driving current flowing from the first transistor T1 to it.

[0185] The following will describe Figure 20 The operation of the circuit shown is particularly important during a single frame. Here, the operation of an exemplary embodiment in which transistors T1, T2, and T3 are N-channel transistors will be described, but the implementation is not limited thereto.

[0186] At the start of a frame, during the initialization cycle, a high-level first scan signal SC and a high-level second scan signal SS are supplied to turn on the second transistor T2 and the third transistor T3. A reference voltage from the data line is supplied through the turned-on second transistor T2 to the gate electrode G1 of the first transistor T1 and one terminal of the capacitor Cst, and an initialization voltage INIT is supplied through the turned-on third transistor T3 to the drain electrode D1 of the first transistor T1 and the anode of the light-emitting diode ED. Accordingly, during the initialization cycle, the drain electrode D1 of the first transistor T1 and the anode of the light-emitting diode ED are initialized to the initialization voltage INIT. At this time, the capacitor Cst stores the voltage difference between the reference voltage and the initialization voltage INIT.

[0187] Next, during the sensing cycle, when the second scan signal SS goes low while the first scan signal SC remains high, the second transistor T2 remains on and the third transistor T3 is off. The gate electrode G1 of the first transistor T1 and one terminal of the capacitor Cst maintain a reference voltage through the on-state second transistor T2, while the drain electrode D1 of the first transistor T1 and the anode of the light-emitting diode ED are disconnected from the initialization voltage INIT through the off-state third transistor T3. Accordingly, when current flows from the source electrode S1 to the drain electrode D1, the first transistor T1 is off, and the voltage at the drain electrode D1 then becomes the reference voltage, or Vth. Vth represents the threshold voltage of the first transistor T1. At this time, the voltage difference between the gate electrode G1 and the drain electrode D1 of the first transistor T1 is stored in the capacitor Cst, and the sensing of the threshold voltage Vth of the first transistor T1 is completed. By generating a data signal during the sensing cycle that compensates for the sensing characteristic information, the characteristic deviation of the first transistor T1, which may differ for each pixel, can be externally compensated.

[0188] Next, during the data input cycle, when a high-level first scan signal SC and a low-level second scan signal SS are supplied, the second transistor T2 is turned on and the third transistor T3 is turned off. The data voltage DAT from the data line is supplied via the turned-on second transistor T2 to one terminal of capacitor Cst and the gate electrode G1 of the first transistor T1. During the data input cycle, the drain electrode D1 of the first transistor T1 and the anode of the light-emitting diode ED can be substantially maintained at the potential that the first transistor T1 was in during the sensing cycle when it was in the off state.

[0189] Next, during the light emission cycle, the first transistor T1, which is turned on by the data voltage DAT transmitted to the gate electrode G1, generates a drive current corresponding to the data voltage DAT, and the light-emitting diode ED can emit light with a brightness corresponding to the drive current.

[0190] Figure 21This is a planar layout diagram of a plurality of pixels PX1, PX2, and PX3 of a display substrate 100 according to an exemplary embodiment, and Figure 22 For along Figure 21 The cross-sectional view of the display device is taken from line XXII-XXII'. Figures 23 to 25 A cross-sectional view of a display device according to an alternative exemplary embodiment is shown.

[0191] refer to Figure 21 and Figure 22 An exemplary embodiment of the display substrate 100 may include a first substrate 110. The first substrate 110 may include an insulating material, such as glass or plastic, and may be flexible.

[0192] In an exemplary embodiment, a lower layer comprising a plurality of lower patterns 111a, 111b, and 111c as a first conductive layer is disposed on the first substrate 110. In an exemplary embodiment, for example, a barrier layer (not shown) of an insulating layer may be disposed between the first substrate 110 and the lower layer. The lower layer is conductive and may include a semiconductor material comprising at least one selected from various conductive metals or having similar conductive properties. Alternatively, the lower layer may be omitted.

[0193] A buffer layer 120 of the insulating layer is disposed on the lower layer. In this embodiment, the lower layer may be disposed between the first substrate 110 and the buffer layer 120.

[0194] An active layer comprising multiple active patterns 130a, 130b, and 130c is disposed on the buffer layer 120. In this embodiment, a lower layer may be disposed between the first substrate 110 and the active layer. The active patterns 130a, 130b, and 130c disposed in each pixel PX1, PX2, and PX3 may include channel regions 134a, 134b, and 134c forming each channel of the plurality of transistors T1, T2, and T3, and conductive regions connected thereto. The conductive regions of the active patterns 130a, 130b, and 130c include source regions 133a, 133b, and 133c and drain regions 135a, 135b, and 135c of each transistor T1, T2, and T3. In each pixel PX1, PX2, and PX3, the active patterns 130a and 130c may be connected to each other.

[0195] The active layer may include semiconductor materials, such as amorphous silicon, polycrystalline silicon, or oxide semiconductors.

[0196] An insulating pattern 144 of the first insulating layer is disposed on the active layer. In an exemplary embodiment, the insulating pattern 144 overlaps with the channel regions 134a, 134b, and 134c of the active patterns 130a, 130b, and 130c, and may be disposed on the channel regions 134a, 134b, and 134c. The insulating pattern 144 may substantially not overlap with the conductive regions of the active patterns 130a, 130b, and 130c.

[0197] The second conductive layer may be disposed on the insulating pattern 144. The second conductive layer may include, as described above, a first scan line 151 for transmitting the first scan signal SC, a second scan line 152 for transmitting the second scan signal SS, a lateral initialization voltage line 153 for transmitting the initialization voltage INIT, a lateral drive voltage line 172b for transmitting the drive voltage ELVDD, a drive gate electrode 155, a second gate electrode 154b, and a third gate electrode 154c. In the circuit diagram above, gate electrodes G1, G2, and G3 correspond to the first gate electrode 154a, the second gate electrode 154b, and the third gate electrode 154c, respectively.

[0198] The first scan line 151, the second scan line 152, the lateral initialization voltage line 153, and the lateral drive voltage line 172b may extend along the first direction DR1. A drive gate electrode 155 may be disposed between the first scan line 151 and the second scan line 152. A second gate electrode 154b is connected to the first scan line 151 and may have a shape that protrudes downward from the first scan line 151. A third gate electrode 154c is connected to the second scan line 152 and may have a shape that protrudes upward from the second scan line 152.

[0199] The driving gate electrode 155 disposed in each pixel PX1, PX2, and PX3 may include an extension 155a that protrudes upward and extends substantially in a second direction DR2 intersecting the first direction DR1, and a first gate electrode 154a that protrudes downward and extends substantially in the second direction DR2. The first gate electrode 154a disposed in pixel PX3 may be folded at least twice at the portion connected to the driving gate electrode 155. In this document, the third direction DR3 may be a direction perpendicular to the first direction DR1 and the second direction DR2.

[0200] The first gate electrode 154a intersects with the active pattern 130a and overlaps with the channel region 134a of the active pattern 130a. The second gate electrode 154b intersects with the active pattern 130b and overlaps with the channel region 134b of the active pattern 130b. The third gate electrode 154c intersects with the active pattern 130c and overlaps with the channel region 134c of the active pattern 130c.

[0201] The second insulating layer 161 may be disposed on the second conductive layer. In an exemplary embodiment, a plurality of contact holes 24, 26, 60, 61, 62, 63, 64, 65, 66, 67, 68 and 69 may be defined by the buffer layer 120 and / or the second insulating layer 161.

[0202] A third conductive layer may be disposed on the second insulating layer 161. The third conductive layer may include a plurality of data lines 171a, 171b and 171c, a drive voltage line 172a, a common voltage line 170, an initialization voltage line 173, a capacitor electrode 175, a plurality of connecting members 174, 176, 177 and 178 and a plurality of drive voltage patterns 172c and 172d.

[0203] Data lines 171a, 171b and 171c, drive voltage line 172a, common voltage line 170, initialization voltage line 173, and drive voltage patterns 172c and 172d extend substantially in the second direction DR2, thereby intersecting with the first scan line 151 and / or the second scan line 152.

[0204] Figure 21 Multiple pixels PX1, PX2, and PX3 in a repeating group, as shown in the diagram, may be arranged repeatedly and adjacent to each other in the first direction DR1. A common voltage line 170 may be provided on both the right and left sides of the multiple pixels PX1, PX2, and PX3 in a group. In an exemplary embodiment, a common voltage line 170 may be provided for each of the multiple pixels PX1, PX2, and PX3 in a repeating group. In an exemplary embodiment, where the multiple pixels PX1, PX2, and PX3 in a repeating group comprises three pixels PX1, PX2, and PX3, data lines 171a, 171b, and 171c, at least one drive voltage line 172a, and at least one initialization voltage line 173 may be provided between two adjacent common voltage lines 170.

[0205] Each data line 171a, 171b and 171c passes through at least one contact hole 64 of the second insulating layer 161. Figure 21 The two contact holes 64 in each pixel PX1, PX2 and PX3 are electrically connected to the source region 133b of the active pattern 130b.

[0206] Figure 21 An end portion 179 of a data line 171a is shown, and each of the data lines 171a, 171b, and 171c may include an end portion 179. The end portion 179 may be disposed in a pad area located at the edge of the display device.

[0207] A driving voltage line 172a may be disposed in a pixel (e.g., pixel PX1), and driving voltage patterns 172c and 172d may be disposed in other pixels PX2 and PX3, respectively. Each driving voltage line 172a may extend in a second direction DR2 to extend to adjacent pixels. In this embodiment, the driving voltage line 172a may include an end portion 172e disposed in the pad area, similar to the data line 171a.

[0208] The driving voltage line 172a and the driving voltage patterns 172c and 172d pass through at least one contact hole 61 of the second insulating layer 161. Figure 21 The two contact holes 61 of pixels PX1 and PX2 and one contact hole 61 of pixel PX3 are electrically connected to the source region 133a of the active pattern 130a. In this embodiment, the driving voltage line 172a and the driving voltage patterns 172c and 172d are connected through at least one contact hole 60 of the second insulating layer 161. Figure 21 The two contact holes 60 of each pixel PX1, PX2 and PX3 are electrically connected to the lateral drive voltage line 172b. Therefore, the lateral drive voltage line 172b and the drive voltage patterns 172c and 172d can transmit the drive voltage ELVDD together with the drive voltage line 172a, and the drive voltage ELVDD in the entire display device can be transmitted in a grid shape in both the first direction DR1 and the second direction DR2.

[0209] The initialization voltage line 173 is electrically connected to the lateral initialization voltage line 153 through the contact hole 69 of the second insulating layer 161. Therefore, the lateral initialization voltage line 153 can transmit the initialization voltage INIT together with the initialization voltage line 173, and even if the initialization voltage line 173 is provided for each of the three pixels PX1, PX2, and PX3, the initialization voltage INIT can be transmitted to all pixels PX1, PX2, and PX3 through the lateral initialization voltage line 153.

[0210] Capacitor electrodes 175 may be included in each pixel PX1, PX2, and PX3. The capacitor electrodes 175 and their corresponding drive gate electrodes 155 may overlap via a second insulating layer 161 between them to form a capacitor Cst.

[0211] The capacitor electrode 175 may include a downwardly projecting connection 175a. The connection 175a passes through at least one contact hole 62 of the second insulating layer 161. Figure 21The three contact holes 62 of each pixel PX1, PX2, and PX3 are electrically connected to the drain region 135a of the active pattern 130a and the source region 133c of the active pattern 130c connected thereto. In this embodiment, the capacitor electrode 175 is electrically connected to the lower pattern 111a via the contact holes 68 of the second insulating layer 161 and the buffer layer 120.

[0212] The connecting member 174 is electrically connected to the second scan line 152 and the lower pattern 111c via the two contact holes 24 of the buffer layer 120 and the second insulating layer 161 or only through the contact holes 24 defined by the second insulating layer 161, thereby electrically connecting the second scan line 152 and the lower pattern 111c.

[0213] The connecting member 176 is electrically connected to the first scan line 151 and the lower pattern 111b via the two contact holes 26 of the buffer layer 120 and the second insulating layer 161, or only via the contact holes 26 defined by the second insulating layer 161.

[0214] The connecting member 177 passes through at least one contact hole 63 in the second insulating layer 161 of each pixel PX1, PX2 and PX3. Figure 21 The two contact holes 63 in each pixel PX1, PX2 and PX3 are electrically connected to the drain region 135c of the active pattern 130c and electrically connected to the lateral initialization voltage line 153 through the contact hole 67 of the second insulating layer 161, so that the drain region 135c of the active pattern 130c can be electrically connected to the lateral initialization voltage line 153.

[0215] The lateral initialization voltage line 153 extends across three pixels PX1, PX2, and PX3 in the first direction DR1. Alternatively, the lateral initialization voltage line 153 may be positioned between two adjacent common voltage lines 170 and may not intersect with the two common voltage lines 170. The lateral initialization voltage line 153 intersects with three adjacent data lines 171a, 171b, and 171c and may extend to the initialization voltage line 173.

[0216] The connecting member 178 passes through at least one contact hole 65 in the second insulating layer 161 of each pixel PX1, PX2 and PX3. Figure 21 The two contact holes 65 in each pixel PX1, PX2 and PX3 are electrically connected to the drain region 135b of the active pattern 130b and electrically connected to the extension 155a of the drive gate electrode 155 through the contact hole 66 of the second insulating layer 161, so that the drain region 135b of the active pattern 130b and the extension 155a of the drive gate electrode 155 can be electrically connected to each other.

[0217] At least one layer selected from the first, second, and third conductive layers may include at least one metal, such as copper (Cu), aluminum (Al), magnesium (Mg), silver (Ag), gold (Au), platinum (Pt), palladium (Pd), nickel (Ni), neodymium (Nd), iridium (Ir), molybdenum (Mo), tungsten (W), titanium (Ti), chromium (Cr), tantalum (Ta), and alloys thereof. Each of the first, second, and third conductive layers may have a single-layer structure or a multi-layer structure.

[0218] In one exemplary embodiment, for example, the third conductive layer may have a multilayer structure comprising a lower layer containing titanium and an upper layer containing copper.

[0219] The first transistor T1 includes a channel region 134a, a source region 133a, a drain region 135a, and a first gate electrode 154a. The source region 133a of the first transistor T1 is electrically connected to the drive voltage line 172a and drive voltage patterns 172c and 172d, thereby receiving the drive voltage ELVDD.

[0220] The lower pattern 111a corresponding to the first transistor T1 overlaps with the channel region 134a between the first transistor T1 and the first substrate 110 to prevent external light from reaching the channel region 134a, thereby reducing leakage current and characteristic degradation. The lower pattern 111a is electrically connected to the drain region 135a of the first transistor T1 through the capacitor electrode 175.

[0221] The second transistor T2 includes a channel region 134b, a source region 133b, a drain region 135b, and a second gate electrode 154b. The source region 133b of the second transistor T2 is electrically connected to data lines 171a, 171b, and 171c, thereby receiving a data voltage DAT or a reference voltage. The drain region 135b of the second transistor T2 is electrically connected to the first gate electrode 154a via a drive gate electrode 155.

[0222] The lower pattern 111b corresponding to the second transistor T2 overlaps with the channel region 134b between the second transistor T2 and the first substrate 110 to prevent external light from reaching the channel region 134b, thereby reducing leakage current and characteristic degradation. In this embodiment, the lower pattern 111b electrically connected to the first scan line 151 may define the dual gate electrode or the second gate electrode 154b of the second transistor T2.

[0223] The third transistor T3 includes a channel region 134c, a source region 133c, a drain region 135c, and a third gate electrode 154c. The drain region 135c of the third transistor T3 can receive the initialization voltage INIT from the lateral initialization voltage line 153.

[0224] The lower pattern 111c corresponding to the third transistor T3 overlaps with the channel region 134c between the third transistor T3 and the first substrate 110 to prevent external light from reaching the channel region 134c, thereby reducing leakage current and characteristic degradation. In this embodiment, the lower pattern 111c electrically connected to the second scan line 152 may define the dual gate electrode or the third gate electrode 154c of the third transistor T3.

[0225] The third insulating layer 181 may be disposed on the second insulating layer 161 and the third conductive layer. The third insulating layer 181 may include a contact hole 83a disposed on the capacitor electrode 175; a contact hole 89a disposed on the end portions 179 of the data lines 171a, 171b and 171c; and a contact hole 81 disposed on the common voltage line 170.

[0226] A fourth conductive layer comprising multiple ohmic contacts 190a, 190b, 190c, 190d and 190e may be disposed on the third insulating layer 181.

[0227] Ohmic contacts 190a, 190b, and 190c can be respectively disposed in pixels PX1, PX2, and PX3 and electrically connected to capacitor electrode 175 via contact hole 83a. Ohmic contact 190d can be electrically connected to common voltage line 170 via contact hole 81. Ohmic contact 190e can be electrically connected to the end portion 179 of data lines 171a, 171b, and 171c via contact hole 89a.

[0228] Ohmic contacts 190a, 190b, 190c, 190d, and 190e improve the adhesion of the capacitor electrode 175, common voltage line 170, and end portions 179 of data lines 171a, 171b, and 171c of the third conductive layer to other conductive layers, and prevent oxidation of the third conductive layer. In an exemplary embodiment, the upper layer of the third conductive layer comprises copper, such that oxidation of the copper can be prevented by the fourth conductive layer. In this embodiment, when the upper layer of the third conductive layer comprises a conductive material (e.g., copper) for preventing corrosion of the upper layer of the third conductive layer, the fourth conductive layer may comprise a conductive material that prevents corrosion of the upper layer of the third conductive layer by covering it. In an exemplary embodiment, for example, the fourth conductive layer may comprise a conductive material of a metal oxide, such as indium tin oxide (“ITO”) and indium zinc oxide (“IZO”).

[0229] A fourth insulating layer 182 may be disposed on the third insulating layer 181 and the fourth conductive layer. Contact holes 83b may be defined by the fourth insulating layer 182 and may include contact holes 89b that expose each ohmic contact 190a, 190b, and 190c and overlap with contact hole 83a, and contact holes 89b disposed on ohmic contact 190e and overlap with contact hole 89a. An opening 355 corresponding to contact hole 89b may be defined by a spacer 350 above the fourth insulating layer 182.

[0230] The ohmic contact (contact member) 190e may be exposed by the contact hole 89b, and thus may make electrical contact with a separate drive circuit chip, circuit film or circuit board.

[0231] At least one of the buffer layer 120, the first insulating layer, the second insulating layer 161, the third insulating layer 181, and the fourth insulating layer 182 may include an inorganic insulating material, such as silicon nitride (SiN). x ), silicon dioxide (SiO) x ) and silicon oxynitride (SiO) x N y The fourth insulating layer 182 may comprise inorganic and / or organic insulating materials, such as polyimide, acrylic polymers, or siloxane polymers, and may have a substantially flat upper surface. The fourth insulating layer 182 will be described in more detail later.

[0232] In an exemplary embodiment, the pixel electrode layer including multiple pixel electrodes 191a, 191b, and 191c may be configured as a fifth conductive layer on the fourth insulating layer 182. The first electrode 191 may include a first pixel electrode 191a, a second pixel electrode 191b, and a third pixel electrode 191c. Pixel electrodes 191a, 191b, and 191c may be configured to correspond to pixels PX1, PX2, and PX3, respectively. Figure 21 It is displayed in the middle.

[0233] The planar dimensions and shapes of the first pixel electrode 191a, the second pixel electrode 191b, and the third pixel electrode 191c may be different from each other.

[0234] In one exemplary embodiment, for example, in the three pixels PX1, PX2, and PX3, the planar dimensions of the second pixel electrode 191b, the first pixel electrode 191a, and the third pixel electrode 191c may decrease in that order. In this embodiment, pixel PX2 may represent green, pixel PX1 may represent red, and pixel PX3 may represent blue.

[0235] Alternatively, the planar size of the first pixel electrode 191a may be the largest, and the planar size of the second pixel electrode 191b may be larger than the planar size of the third pixel electrode 191c.

[0236] Pixel electrodes 191a, 191b, and 191c can contact ohmic contacts (contact members) 190a, 190b, and 190c respectively through contact holes 83b, and are electrically connected to capacitor electrode 175 through ohmic contacts 190a, 190b, and 190c. Accordingly, each pixel electrode 191a, 191b, and 191c is electrically connected to the drain region 135a of the first transistor T1, thereby receiving voltage from the first transistor T1.

[0237] The pixel electrode layer may include a semi-transparent conductive material or a reflective conductive material.

[0238] The spacer 350 may be disposed on the fourth insulating layer 182. The spacer 350 has openings 355 disposed on the pixel electrodes 191a, 191b, and 191c. The spacer 350 may comprise an organic or inorganic material. In one exemplary embodiment, for example, the spacer 350 may comprise an inorganic material comprising silicon. The spacer 350 may comprise materials selected from SiO2. x SiN x SiO x N y And at least one of siloxanes. In this embodiment, the separator 350 may further include carbon in the silicon-containing inorganic material.

[0239] When the spacer 350 comprises an inorganic material containing Si, the absorption of lower wavelength light is relatively low compared to when the spacer 350 comprises an organic material. In an exemplary embodiment, the spacer 350 comprises an inorganic material with low light absorption, such that the amount of light reflected by the first electrode 191 disposed in the second region A2 is absorbed into the spacer 350 is reduced, thereby increasing the light emission efficiency.

[0240] A light-emitting element layer 370 is disposed on the separator 350 and the pixel electrode layer. The light-emitting element layer 370 may include a portion disposed within an opening 355 of the separator 350. The light-emitting element layer 370 may include an organic light-emitting material or an inorganic light-emitting material.

[0241] The second electrode 270 is disposed on the light-emitting element layer 370. The second electrode 270 may be a common electrode. The second electrode 270 may be continuously formed across multiple pixels PX1, PX2 and PX3. The second electrode 270 may be electrically connected to the common voltage line 170 by contacting the ohmic contact 190d through the contact hole 82, thereby receiving the common voltage ELVSS.

[0242] The second electrode 270 may include a conductive transparent material.

[0243] The pixel electrodes 191a, 191b, and 191c of each pixel PX1, PX2, and PX3, the light-emitting element layer 370, and the second electrode 270 collectively define a light-emitting element LED. One of the pixel electrodes 191a, 191b, and 191c and the second electrode 270 may be a cathode, and the other of the pixel electrodes 191a, 191b, and 191c and the second electrode 270 may be an anode. For ease of description, an exemplary embodiment in which the pixel electrodes 191a, 191b, and 191c are anodes is described herein.

[0244] refer to Figure 21 The lower pattern 111a may further include an extension 111aa that overlaps with the driving voltage line 172a and the driving voltage patterns 172c and 172d in the planar view. Accordingly, the planar dimension of the lower pattern 111a may be larger than the planar dimension of the lower pattern 111b or the lower pattern 111c. According to an exemplary embodiment, the lower pattern 111a is electrically connected to the pixel electrodes 191a, 191b and 191c, which serve as anodes, via capacitor electrodes 175, and as the extension 111aa of the lower pattern 111a overlaps with the driving voltage line 172a and the driving voltage patterns 172c and 172d for transmitting a predetermined voltage via buffer layer 120 and second insulating layer 161, a capacitor Ced for maintaining the voltage of the anode can be formed.

[0245] The extension 111aa may also overlap with the source region 133a of the active pattern 130a connected to the drive voltage line 172a.

[0246] In an exemplary embodiment, the lower pattern 111a is electrically connected to the pixel electrodes 191a, 191b, and 191c via capacitor electrodes 175 and also overlaps with the channel region 134a of the first transistor T1. Furthermore, the rate of change of current decreases in the saturation region of the voltage-current characteristic diagram of the first transistor T1, thereby widening the range of the region where the output current of the first transistor T1 is constant. Therefore, even if the source-drain voltage (Vds) of the first transistor T1 changes, the output current of the first transistor T1 remains at a constant level, thus improving the output saturation characteristics. Consequently, the brightness deviation between pixels caused by the output current of the first transistor T1 is reduced, thereby improving image quality.

[0247] refer to Figure 22The fourth insulating layer 182 includes a first region A1, a second region A2, and a third region A3. The first region A1 has a smaller thickness than the third region A3. In this embodiment, the top of the first region A1 is positioned closer to the first substrate 110 than the top of the third region A3. The second region A2 has an inclined surface that serves as a connection between the first region A1 and the third region A3. A first electrode 191 is disposed on the inclined surface of the second region A2, and the first electrode 191 reflects light emitted from the light-emitting element layer 370 to the side surface to increase light emission efficiency.

[0248] exist Figure 22 In an exemplary embodiment, the separator 350 may include an inorganic material comprising silicon. In one exemplary embodiment, for example, the separator 350 may include materials selected from SiO2. x SiN x SiO x N y And at least one of siloxanes. In this embodiment, the separator 350 may further include carbon in the silicon-containing inorganic material.

[0249] In this embodiment, the display device has improved light emission efficiency. Figure 1 The structure is similar to that of the exemplary implementation. Accordingly, any repeated detailed descriptions thereof will be omitted.

[0250] Figure 23 A cross-sectional view of a display device according to another alternative exemplary embodiment. Reference Figure 23 An exemplary embodiment of the display device includes a reflective member 410 disposed between a fourth insulating layer 182 and a first electrode 191. Figure 23 The exemplary implementation corresponds to Figure 5 Exemplary implementations. Figure 23 The same or similar elements shown in the text have been used in the description above. Figure 5 The exemplary embodiments of the display device shown herein are labeled with the same reference numerals, and any repeated detailed descriptions thereof will be omitted or simplified below.

[0251] refer to Figure 23 In an exemplary embodiment, the side surface of the reflective member 410 may be inclined. The first electrode 191 may be disposed on both the inclined side surface and the flat upper surface of the reflective member 410. Because the first electrode 191 has an inclined side surface along the side surface of the reflective member 410, as in... Figure 22 Therefore, the light emitted to the side surface of the light-emitting element layer 370 is reflected by the reflective member 410 and the first electrode 191, thereby increasing the light emission efficiency.

[0252] Figure 24To display and Figure 22 A cross-sectional view of the same section according to another alternative exemplary embodiment. Reference Figure 24 An exemplary embodiment of the display device includes a reflective member 410 disposed on a first electrode 191. Figure 24 The exemplary implementation corresponds to Figure 8 Exemplary implementations. Figure 24 The same or similar elements shown in the text have been used in the description above. Figure 8 The exemplary embodiments of the display device shown herein are labeled with the same reference numerals, and any repeated detailed descriptions thereof will be omitted or simplified below.

[0253] In this embodiment, the side surface of the reflective member 410 may be inclined. Light emitted to the side surface of the light-emitting element layer 370 can be reflected by the reflective member 410 to increase light emission efficiency. (Reference) Figure 24 One edge of the reflective member 410 and one edge of the first electrode 191 may be disposed on the same plane. In this embodiment, one side surface of the reflective member 410 and one side surface of the first electrode 191 form the same inclined surface. In this embodiment, the reflective member 410 and the first electrode 191 can be formed by the same process.

[0254] Figure 25 This is a cross-sectional view of a display device according to another alternative exemplary embodiment. Figure 25 The exemplary embodiments of the display device shown in the above reference are similar. Figure 24 The exemplary embodiments described are substantially the same, except that the side edge of the reflective member 410 is not aligned with the side edge of the first electrode 191. Figure 25 The same or similar elements shown in the text have been used in the description above. Figure 24 The exemplary embodiments of the display device shown herein are labeled with the same reference numerals, and any repeated detailed descriptions thereof will be omitted or simplified below.

[0255] As described herein, in an exemplary embodiment of the display device according to the invention, the insulating layer includes a sloped surface or the reflective member includes a sloped surface. Accordingly, in this embodiment, light emission efficiency is increased by reflecting light emitted to the side surface of the light-emitting element layer by the first electrode. In this embodiment, the insulator comprises an inorganic material such that the transmittance of light reflected by the first electrode is increased, and the insulator comprises a material having a refractive index similar to that of the light-emitting element layer, thereby allowing light reflected by the first electrode to exit through the interface between the light-emitting element layer and the insulator. Therefore, the light emission efficiency of the display device is increased.

[0256] Although the invention has been described in conjunction with exemplary embodiments now considered practical, it is to be understood that the invention is not limited to the disclosed embodiments. Rather, it is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.

Claims

1. A display device, comprising: Transistors disposed on the first substrate; An insulating layer disposed on the transistor; The first electrode is disposed on the insulating layer; An insulating element disposed on the first electrode and the insulating layer, wherein an opening is defined by the insulating element; A light-emitting element layer disposed in the opening; as well as The second electrode is disposed on the light-emitting element layer and the insulating material. The insulating layer includes a first region and a third region with different heights from each other, and a second region having an inclined surface connecting the first region and the third region. The first region has a lower height than the third region, and The first electrode overlaps with the first region in a direction perpendicular to the first substrate. The uppermost surface of the separator is positioned at the same height as the lowermost surface of the second electrode or closer to the first substrate than the lowermost surface of the second electrode.

2. The display device as claimed in claim 1, wherein: The separator comprises an inorganic material containing silicon.

3. The display device as claimed in claim 2, wherein: The separator further includes carbon.

4. The display device as claimed in claim 1, wherein: The separator comprises at least one material selected from SiOx, SiNx, SiOxNy, and siloxanes.

5. The display device as claimed in claim 1, wherein: The thickness of the separator is in the range of 1000 Å to 3000 Å.

6. The display device as claimed in claim 1, wherein: The refractive index difference between the isolator and the light-emitting element layer is less than 50% of the refractive index of the isolator.

7. The display device as claimed in claim 1, wherein: The barrier has an inclined surface that overlaps with the second region.

8. The display device as claimed in claim 7, wherein: The first electrode in the second region is disposed between the insulating layer and the separator.

9. A display device, comprising: Transistors mounted on a substrate; An insulating layer disposed on the transistor; The first electrode is disposed on the insulating layer; A reflective member disposed between the insulating layer and the first electrode; An insulating element disposed on the first electrode and the insulating layer, wherein an opening is defined by the insulating element; A light-emitting element layer disposed in the opening; as well as The second electrode is disposed on the light-emitting element layer and the insulating material. The side surface of the reflective member adjacent to the opening includes an inclined surface. The uppermost surface of the separator is positioned at the same height as the lowermost surface of the second electrode or closer to the substrate than the lowermost surface of the second electrode.

10. A display device, comprising: Transistors mounted on a substrate; An insulating layer disposed on the transistor; The first electrode is disposed on the insulating layer; A reflective component disposed on the first electrode; A spacer is disposed on the first electrode, the reflective member, and the insulating layer, wherein an opening is defined by the spacer; A light-emitting element layer disposed in the opening; as well as The second electrode is disposed on the light-emitting element layer and the insulating material. The side surface of the reflective member adjacent to the opening includes an inclined surface. The uppermost surface of the separator is positioned at the same height as the lowermost surface of the second electrode or closer to the substrate than the lowermost surface of the second electrode.

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