Display device

Abstract

The present disclosure relates to a display device, wherein a display device according to one embodiment comprises a substrate, a common voltage line located on the substrate, a protective layer located on the common voltage line, a connecting electrode located on the protective layer and connected to the common voltage line, a pixel defining layer located on the connecting electrode and including a first opening, a light-emitting layer located on the pixel defining layer, and a common electrode located on the light-emitting layer and connected to the connecting electrode through the first opening, and the protective layer includes a second opening surrounding the first opening.

Description

Technology Field

[0001] The present disclosure relates to a display device. Background Technology

[0002] A display device is a device that displays an image, and includes Liquid Crystal Displays (LCDs) and Organic Light Emitting Diodes (OLEDs). These display devices are used in a wide variety of electronic devices, such as mobile phones, navigation systems, digital cameras, e-books, portable game consoles, and various terminals.

[0003] Organic light-emitting displays (OLEDs) possess self-luminous characteristics and, unlike liquid crystal displays (LCDs), do not require a separate light source, allowing for reduced thickness and weight. Furthermore, OLEDs offer high-quality characteristics such as low power consumption, high brightness, and fast response speeds.

[0004] Such an organic light-emitting display device includes a plurality of pixels comprising organic light-emitting diodes, which are self-luminous elements, and each pixel is formed with a plurality of transistors and one or more capacitors for driving the organic light-emitting diodes. The plurality of transistors basically include switching transistors and driving transistors.

[0005] An insulating layer is located between these transistors and electrodes. This insulating layer may be composed of organic materials, and gas can be generated within the insulating layer during manufacturing processes, such as laser drilling. This generated gas can move within the insulating layer and may not be emitted because it is shielded by the electrodes located on top of it. Consequently, there is a problem in that the electrodes, wiring, or light-emitting elements located on the insulating layer are affected by this gas, leading to defects. The problem to be solved

[0006] The embodiments are intended to provide a display device capable of preventing defects in electrodes, wiring, light-emitting elements, etc. means of solving the problem

[0007] A display device according to one embodiment comprises a substrate, a common voltage line located on the substrate, a protective layer located on the common voltage line, a connecting electrode located on the protective layer and connected to the common voltage line, a pixel defining layer located on the connecting electrode and including a first opening, a light-emitting layer located on the pixel defining layer, and a common electrode located on the light-emitting layer and connected to the connecting electrode through the first opening, wherein the protective layer includes a second opening surrounding the first opening.

[0008] The connecting electrode may be located within the second opening.

[0009] The above connecting electrode can cover the side of the protective layer within the second opening.

[0010] The portion of the protective film surrounded by the second opening and the portion of the protective film located outside the second opening can be separated by the connecting electrode.

[0011] The second opening may have a closed-loop shape in a planar view.

[0012] The first opening above may not overlap with the second opening above.

[0013] The above protective film may include a first protective film comprising an inorganic insulating material, and a second protective film located on the first protective film and comprising an organic insulating material.

[0014] The second opening is formed in the second protective film and may not be formed in the first protective film.

[0015] The second opening may be formed in the first protective film and the second protective film.

[0016] The above connecting electrode can be connected to the common voltage line through the second opening.

[0017] The above connecting electrode includes a third opening, and the third opening may be surrounded by the second opening.

[0018] The third opening may overlap with the portion of the protective film surrounded by the second opening.

[0019] The pixel definition layer may further include a fourth opening that overlaps with the third opening.

[0020] The planar size of the fourth opening may be smaller than the planar size of the third opening.

[0021] The pixel definition layer can cover the side of the connecting electrode within the third opening.

[0022] The light-emitting layer may not be located in at least some area within the first opening.

[0023] A display device according to one embodiment comprises a substrate, a common voltage line located on the substrate, a protective layer located on the common voltage line, a connecting electrode located on the protective layer and connected to the common voltage line, a pixel defining layer located on the connecting electrode and including a first opening, a light-emitting layer located on the pixel defining layer, and a common electrode located on the light-emitting layer and connected to the connecting electrode through the first opening, wherein the connecting electrode includes a fifth opening, and the fifth opening surrounds the first opening.

[0024] The above fifth opening may be covered by the pixel definition layer.

[0025] The above-mentioned fifth opening may have an open-loop shape in a planar view.

[0026] The first opening above may not overlap with the fifth opening above. Effects of the invention

[0027] According to the embodiments, defects in electrodes, wiring, light-emitting elements, etc. of a display device can be prevented. Brief explanation of the drawing

[0028] FIG. 1 is a circuit diagram of a pixel of a display device according to one embodiment. FIG. 2 is a plan view showing a part of a display device according to one embodiment. Figure 3 is a cross-sectional view along line II-II of Figure 2. FIGS. 4 and FIGS. 5 are drawings showing a portion of a display device in which laser processing is performed according to one embodiment. Figure 6 is a cross-sectional view showing the state in which a common electrode is formed after laser processing. FIG. 7 is a cross-sectional view showing one pixel of a display device according to one embodiment. FIG. 8 is a plan view showing a part of a layer of a display device according to one embodiment. FIG. 9 is a plan view showing a part of a display device according to a comparative example. Figure 10 is a cross-sectional view along line XX of Figure 9. FIGS. 11 to 13 are drawings showing the movement path of a gas generated in a display device according to a comparative example. FIGS. 14 to 16 are drawings showing the movement path of a gas generated in a display device according to one embodiment. FIG. 17 is a cross-sectional view showing a display device according to one embodiment. FIG. 18 is a plan view showing a part of a display device according to one embodiment. FIG. 19 is a cross-sectional view along the line XIX-XIX of FIG. 18. FIG. 20 is a plan view showing a part of a display device according to one embodiment. FIG. 21 is a cross-sectional view along the line XXI-XXI of FIG. 20. FIG. 22 is a cross-sectional view illustrating some components of a display device according to one embodiment. Specific details for implementing the invention

[0029] Hereinafter, various embodiments of the present invention will be described in detail with reference to the attached drawings so that those skilled in the art can easily implement the present invention. The present invention may be embodied in various different forms and is not limited to the embodiments described herein.

[0030] To clearly explain the present invention, parts unrelated to the explanation have been omitted, and the same reference numerals are used for identical or similar components throughout the specification.

[0031] Furthermore, the size and thickness of each component shown in the drawings are depicted arbitrarily for convenience of explanation, and thus the present invention is not necessarily limited to what is illustrated. Thicknesses have been enlarged in the drawings to clearly represent various layers and regions. Additionally, for convenience of explanation, the thickness of some layers and regions has been exaggerated in the drawings.

[0032] Furthermore, when it is said that a part, such as a layer, membrane, region, or plate, is "on" or "on" another part, this includes not only the case where it is "directly above" the other part, but also the case where there is another part in between. Conversely, when it is said that a part is "directly above" another part, it means that there is no other part in between. Also, saying that a part is "on" or "on" a reference part means that it is located above or below the reference part, and does not necessarily mean that it is located "on" or "on" in the direction opposite to gravity.

[0033] Furthermore, throughout the specification, when a part is described as "including" a certain component, this means that, unless specifically stated otherwise, it does not exclude other components but may include additional components.

[0034] Additionally, throughout the specification, "planar" means when the subject part is viewed from above, and "cross-sectional" means when the cross-section obtained by vertically cutting the subject part is viewed from the side.

[0035] First, a display device according to one embodiment will be described as follows with reference to FIG. 1.

[0036] FIG. 1 is a circuit diagram of a pixel of a display device according to one embodiment.

[0037] A display device according to one embodiment includes a plurality of pixels (PX). Each of the plurality of pixels (PX) may include a plurality of transistors (T1, T2, T3), a capacitor (Cst), and at least one light-emitting diode (ED) which is a light-emitting element, as shown in FIG. 1. In this embodiment, an example in which one pixel (PX) includes one light-emitting diode (ED) is mainly described.

[0038] A plurality of transistors (T1, T2, T3) include a driving transistor (T1), a switching transistor (T2), and an initialization transistor (T3). The first electrode and the second electrode described below are intended to distinguish two electrodes located on opposite sides of the channel of each transistor (T1, T2, T3), and may be a source electrode or a drain electrode.

[0039] The gate electrode of the driving transistor (T1) is connected to one end of the capacitor (Cst), the first electrode of the driving transistor (T1) is connected to a driving voltage line that transmits a driving voltage (ELVDD), and the second electrode of the driving transistor (T1) is connected to the anode of the light-emitting diode (ED) and the other end of the capacitor (Cst). The driving transistor (T1) receives a data voltage (DAT) according to the switching operation of the switching transistor (T2) and can supply a driving current to the light-emitting diode (ED) according to the voltage stored in the capacitor (Cst).

[0040] The gate electrode of the switching transistor (T2) is connected to a first scan line that transmits a first scan signal (SC), the first electrode of the switching transistor (T2) is connected to a data line that can transmit a data voltage (DAT) or a reference voltage, and the second electrode of the switching transistor (T2) is connected to one end of the capacitor (Cst) and the gate electrode of the driving transistor (T1). The switching transistor (T2) is turned on according to the first scan signal (SC) and can transmit a reference voltage or a data voltage (DAT) to the gate electrode of the driving transistor (T1) and one end of the capacitor (Cst).

[0041] The gate electrode of the initialization transistor (T3) is connected to a second scan line that transmits a second scan signal (SS), the first electrode of the initialization transistor (T3) is connected to the other end of the capacitor (Cst), the second electrode of the driving transistor (T1), and the anode of the light-emitting diode (ED), and the second electrode of the initialization transistor (T3) is connected to an initialization voltage line that transmits an initialization voltage (INIT). The initialization transistor (T3) is turned on according to the second scan signal (SS) to transmit the initialization voltage (INIT) to the anode of the light-emitting diode (ED) and the other end of the capacitor (Cst), thereby initializing the voltage of the anode of the light-emitting diode (ED).

[0042] One end of the capacitor (Cst) is connected to the gate electrode of the driving transistor (T1), and the other end is connected to the first electrode of the initialization transistor (T3) and the pixel electrode, which is the anode of the light-emitting diode (ED). The common electrode, which is the cathode of the light-emitting diode (ED), is connected to a common voltage line that transmits the common voltage (ELVSS).

[0043] The light-emitting diode (ED) can emit light of brightness according to the driving current generated by the driving transistor (T1).

[0044] Although it has been described above that one pixel (PX) includes three transistors (T1, T2, T3) and one capacitor (Cst), it is not limited thereto, and the number of transistors, the number of capacitors, and their connection relationships can be varied.

[0045] Below, an example of the operation of the circuit illustrated in FIG. 1, in particular an example of operation during one frame, is described. Here, the case where the transistors (T1, T2, T3) are N-type channel transistors is described as an example, but is not limited thereto.

[0046] When a frame begins, a high-level first scan signal (SC) and a high-level second scan signal (SS) are supplied during the initialization period, and the switching transistor (T2) and the initialization transistor (T3) are turned on. Through the turned-on switching transistor (T2), a reference voltage from the data line is supplied to the gate electrode of the driving transistor (T1) and one end of the capacitor (Cst), and through the turned-on initialization transistor (T3), an initialization voltage (INIT) is supplied to the second electrode of the driving transistor (T1) and the anode of the light-emitting diode (ED). Accordingly, during the initialization period, the second electrode of the driving transistor (T1) and the anode of the light-emitting diode (ED) are initialized to the initialization voltage (INIT). At this time, the difference voltage between the reference voltage and the initialization voltage (INIT) is stored in the capacitor (Cst).

[0047] Next, when the second scan signal (SS) becomes low level while the first scan signal (SC) remains at a high level during the sensing period, the switching transistor (T2) remains in the turned-on state and the initialization transistor (T3) is turned off. Through the turned-on switching transistor (T2), the gate electrode of the driving transistor (T1) and one end of the capacitor (Cst) maintain the reference voltage, and through the turned-off initialization transistor (T3), the second electrode of the driving transistor (T1) and the anode of the light-emitting diode (ED) are disconnected from the initialization voltage (INIT). Accordingly, current flows from the first electrode to the second electrode of the driving transistor (T1), and when the voltage of the second electrode becomes "reference voltage - Vth," the driving transistor (T1) is turned off. Vth represents the threshold voltage of the driving transistor (T1). At this time, the voltage difference between the gate electrode and the second electrode of the driving transistor (T1) is stored in the capacitor (Cst), and the sensing of the threshold voltage (Vth) of the driving transistor (T1) is completed. By generating a compensated data signal that reflects the characteristic information sensed during the sensing period, the characteristic deviation of the driving transistor (T1), which may differ from pixel to pixel, can be externally compensated.

[0048] Next, when a high-level first scan signal (SC) is supplied and a low-level second scan signal (SS) is supplied in the data input section, the switching transistor (T2) is turned on and the initialization transistor (T3) is turned off. Through the turned-on switching transistor (T2), the data voltage (DAT) from the data line is supplied to the gate electrode of the driving transistor (T1) and one end of the capacitor (Cst). At this time, the second electrode of the driving transistor (T1) and the anode of the light-emitting diode (ED) can maintain the potential in the sensing section almost as it is due to the driving transistor (T1) which is in the turned-off state.

[0049] Next, the driving transistor (T1), which is turned on by the data voltage (DAT) delivered to the gate electrode in the light-emitting section, generates a driving current according to the data voltage (DAT), and the light-emitting diode (ED) can emit light by the driving current.

[0050] Hereinafter, with reference to FIGS. 2 to 6, the connection portion of the common electrode, which is the cathode of the light-emitting diode (ED), and the common voltage line that transmits the common voltage (ELVSS) will be described.

[0051] FIG. 2 is a plan view showing a part of a display device according to one embodiment, and FIG. 3 is a cross-sectional view along line II-II of FIG. 2. FIG. 4 and FIG. 5 are drawings showing a part of the display device according to one embodiment where laser processing is performed. FIG. 5 is a cross-sectional view along line VV of FIG. 4. FIG. 6 is a cross-sectional view showing the state in which a common electrode is formed after laser processing.

[0052] First, as illustrated in FIGS. 2 and 3, a display device according to one embodiment includes a substrate (110), and a buffer layer (111), which is an insulating layer, may be located on the substrate (110). Although not illustrated, a first conductive layer may be located between the substrate (110) and the buffer layer (111). A first insulating layer (120) may be located on the buffer layer (111). Although not illustrated, a semiconductor layer may be located between the buffer layer (111) and the first insulating layer (120). A second insulating layer (160) may be located on the first insulating layer (120). Although not illustrated, a second conductive layer may be located between the first insulating layer (120) and the second insulating layer (160).

[0053] A third conductive layer including a common voltage line (170) may be located on the second insulating layer (160). Although the planar shape of the common voltage line (170) is omitted from the illustration, it may be extended along one direction. A common voltage (ELVSS) may be applied to the common voltage line (170). An auxiliary line for transmitting the common voltage (ELVSS) may be additionally located on the first or second conductive layer, and such an auxiliary line may be electrically connected to the common voltage line (170).

[0054] A protective layer (180) may be positioned on a third conductive layer including a common voltage line (170). The protective layer (180) may include a first protective layer (180a) and a second protective layer (180b). The second protective layer (180b) may be positioned on the first protective layer (180a).

[0055] At least one of the first conductive layer, the second conductive layer, and the third conductive layer 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 conductive layer, the second conductive layer, and the third conductive layer may be composed of a single layer or multiple layers. For example, it may have a multilayer structure including a lower layer containing titanium and an upper layer containing copper.

[0056] At least one of the buffer layer (111), the first insulating layer (120), the second insulating layer (160), and the protective layer (180) may include an inorganic insulating material such as silicon nitride (SiNx), silicon oxide (SiOx), or silicon nitrate (SiON), and / or an organic insulating material such as polyimide, an acrylic polymer, or a siloxane polymer. In this case, the first protective layer (180a) of the protective layer (180) may be made of an inorganic insulating material, and the second protective layer (180b) may be made of an organic insulating material.

[0057] A fourth conductive layer including a connecting electrode (195) may be positioned on the protective layer (180). The fourth conductive layer may include a transparent metal oxide such as ITO (Indium Tin Oxide) or IZO (Indium Zinc Oxide). The fourth conductive layer may be composed of multiple layers. For example, the fourth conductive layer may be composed of a triple layer in which a layer containing ITO, a layer containing silver (Ag), and a layer containing ITO are stacked in sequence. The planar shape of the connecting electrode (195) may be polygonal. For example, the connecting electrode (195) may have a shape including a portion that is approximately octagonal and a portion that protrudes from one side of the octagon.

[0058] The protective layer (180) may include a second opening (1180) and a sixth opening (1182). The second opening (1180) and the sixth opening (1182) refer to areas where the protective layer (180) is removed. The second opening (1180) and the sixth opening (1182) may overlap with a common voltage line (170). The second opening (1180) may be formed only in the second protective layer (180b) and not in the first protective layer (180a). The sixth opening (1182) may be formed in the first protective layer (180a) and the second protective layer (180b). Accordingly, the depth of the sixth opening (1182) may be formed deeper than the depth of the second opening (1180). The upper surface of the common voltage line (170) may be exposed by the sixth opening (1182). The upper surface of the common voltage line (170) that overlaps with the second opening (1180) may not be exposed. The second opening (1180) and the sixth opening (1182) may overlap with the connecting electrode (195). The second opening (1180) may overlap with the approximately octagonal portion of the connecting electrode (195) and the surrounding area. The sixth opening (1182) may overlap with the protruding portion of the connecting electrode (195). The connecting electrode (195) may be located within the second opening (1180) and the sixth opening (1182). The connecting electrode (195) may be formed to cover the side of the second protective layer (180b) within the second opening (1180). The second opening (1180) of the protective layer (180) may be formed in a closed loop shape to surround a predetermined area. The portion of the second protective layer (180b) surrounded by the second opening (1180) may be completely separated from the portion of the second protective layer (180b) located outside the second opening (1180).A connecting electrode (195) within this second opening (1180) can serve to block the portion of the second protective layer (180b) surrounded by the second opening (1180) and the portion of the second protective layer (180b) located outside the second opening (1180). The connecting electrode (195) can be formed to cover the sides of the first protective layer (180a) and the second protective layer (180b) within the sixth opening (1182). Additionally, the connecting electrode (195) can be formed to cover the upper surface of the common voltage line (170) within the sixth opening (1182). Thus, the connecting electrode (195) can be connected to the common voltage line (170) through the sixth opening (1182).

[0059] The connecting electrode (195) may include a third opening (1195). The planar shape of the third opening (1195) of the connecting electrode (195) may be approximately rectangular. The second opening (1180) of the protective layer (180) may have a shape that surrounds a predetermined area, and the third opening (1195) of the connecting electrode (195) may be located within the area surrounded by the second opening (1180). The third opening (1195) of the connecting electrode (195) does not overlap with the second opening (1180). At least a portion of the protective layer (180) may be exposed by the third opening (1195) of the connecting electrode (195). At this time, a portion of the upper surface of the second protective layer (180b) may be exposed.

[0060] A pixel defining layer (350) may be positioned on a fourth conductive layer including a connecting electrode (195). The pixel defining layer (350) may include an organic insulating material such as a polyacrylic resin or a polyimide resin. The pixel defining layer (350) may include a first opening (1350) and a fourth opening (1352).

[0061] The first opening (1350) of the pixel definition layer (350) may overlap with the connecting electrode (195). The first opening (1350) of the pixel definition layer (350) may overlap with the octagonal portion of the connecting electrode (195). At this time, the first opening (1350) of the pixel definition layer (350) may overlap with the center of the octagonal portion of the connecting electrode (195). Additionally, the first opening (1350) of the pixel definition layer (350) may overlap with the protective layer (180). The first opening (1350) of the pixel definition layer (350) may be located within the area surrounded by the second opening (1180) of the protective layer (180). The first opening (1350) of the pixel definition layer (350) does not overlap with the second opening (1180) of the protection layer (180). At least a portion of the connecting electrode (195) may be exposed by the first opening (1350) of the pixel definition layer (350).

[0062] The fourth opening (1352) of the pixel definition layer (350) may overlap with the third opening (1195) of the connecting electrode (195). The fourth opening (1352) of the pixel definition layer (350) may be located within the third opening (1195) of the connecting electrode (195). The planar size of the fourth opening (1352) of the pixel definition layer (350) may be smaller than the planar size of the third opening (1195) of the connecting electrode (195). The side of the connecting electrode (195) may be exposed by the third opening (1195) of the connecting electrode (195). At this time, a layer containing silver (Ag) located in the center of the connecting electrode (195), which is composed of a triple layer, may be exposed. In a display device according to one embodiment, the pixel defining layer (350) is formed to cover the edge of the third opening (1195) of the connecting electrode (195), thereby preventing the side of the connecting electrode (195) from being exposed. That is, the pixel defining layer (350) is formed to cover the side of the connecting electrode (195) within the third opening (1195) of the connecting electrode (195). Thus, a layer containing silver (Ag) located in the center of the connecting electrode (195) can be protected. At least a portion of the protective layer (180) may be exposed by the fourth opening (1352) of the pixel defining layer (350). At this time, a portion of the upper surface of the second protective layer (180b) may be exposed.

[0063] Next, as illustrated in FIGS. 4 and 5, a light-emitting layer (370) may be positioned on the pixel defining layer (350). The light-emitting layer (370) may be positioned entirely on the substrate (110) and may also be positioned within the first opening (1350) and the fourth opening (1352) of the pixel defining layer (350). The light-emitting layer (370) may include an organic light-emitting material or an inorganic light-emitting material.

[0064] Next, a laser (500) can be irradiated onto a portion corresponding to the first opening (1350) of the pixel definition layer (350). That is, a laser drilling process can be performed, and accordingly, as shown in FIG. 6, a portion of the light-emitting layer (370) located within the first opening (1350) of the pixel definition layer (350) can be removed. Thus, the light-emitting layer (370) may not be located in at least some area within the first opening (1350) of the pixel definition layer (350). As a portion of the light-emitting layer (370) is removed, a connecting electrode (195) located below the light-emitting layer (370) may be exposed. That is, a portion of the connecting electrode (195) that overlaps with the first opening (1350) of the pixel definition layer (350) may be exposed.

[0065] A common electrode (270) may be located on the light-emitting layer (370). The common electrode (270) may include a metal material containing silver (Ag) or a transparent metal oxide such as ITO (Indium Tin Oxide), IZO (Indium Zinc Oxide), etc. The common electrode (270) may be located entirely on the substrate (110). The common electrode (270) may be located within the first opening (1350) of the pixel defining layer (350). The common electrode (270) may be connected to a connecting electrode (195) through the first opening (1350) of the pixel defining layer (350). The common electrode (270) may be connected to a common voltage line (170) through the connecting electrode (195) and may receive a common voltage (ELVSS).

[0066] Hereinafter, a pixel of a display device according to one embodiment will be described with reference to FIG. 7.

[0067] FIG. 7 is a cross-sectional view showing one pixel of a display device according to one embodiment.

[0068] As illustrated in FIG. 7, a first conductive layer located on a substrate (110) may include a light-blocking pattern (177). A buffer layer (111) may be located on the light-blocking pattern (177). A semiconductor layer located on the buffer layer (111) may include a channel (1132) of a driving transistor (T1), a first region (1131), and a second region (1133). The channel (1132) of the driving transistor (T1) may be located between the first region (1131) and the second region (1133). A first insulating layer (120) may be located on the semiconductor layer.

[0069] A second conductive layer located on the first insulating layer (120) may include a gate electrode (1155) and a lower holding electrode (1153) of a driving transistor (T1). The gate electrode (1155) of the driving transistor (T1) may overlap with the channel (1132) of the driving transistor (T1). The gate electrode (1155) of the driving transistor (T1) may be connected to the lower holding electrode (1153) and may be formed integrally. After forming the second conductive layer, a doping process or plasma treatment may be performed. The portion of the semiconductor layer covered by the second conductive layer is not doped or plasma treated, and the portion of the semiconductor layer not covered by the second conductive layer is doped or plasma treated and may have the same characteristics as a conductor. The channel (1132) of the driving transistor (T1) is not doped or plasma treated. The first region (1131) and the second region (1133) of the driving transistor (T1) may have the same characteristics as the conductor and may each become the first electrode and the second electrode.

[0070] A second insulating layer (160) may be located on the second conductive layer. A third conductive layer located on the second insulating layer (160) may include an upper holding electrode (1154). The upper holding electrode (1154) may be located in the same layer as the common voltage line (170). The upper holding electrode (1154) and the common voltage line (170) may include the same material and may be formed together in the same process. The upper holding electrode (1154) may overlap with the lower holding electrode (1154). The lower holding electrode (1153) and the upper holding electrode (1154) may overlap each other with the second insulating layer (160) in between to form a capacitor (Cst). Since the lower holding electrode (1153) may also overlap with the light-blocking pattern (177) with the first insulating layer (120) in between, a double capacitor (Cst) may be formed. The upper retaining electrode (1154) may overlap with the second region (1133) of the driving transistor (T1). The second insulating layer (160) may include an opening (165) that overlaps the upper retaining electrode (1154) and the second region (1133) of the driving transistor (T1). The opening (165) may be further formed in the first insulating layer (120). The upper retaining electrode (1154) may be connected to the second region (1133) of the driving transistor (T1) through the opening (165).

[0071] A protective layer (180) may be located on the third conductive layer, and the protective layer (180) may include a first protective layer (180a) and a second protective layer (180b) located on the first protective layer (180a).

[0072] A fourth conductive layer located on the protective layer (180) may include a pixel electrode (191). The pixel electrode (191) may be located in the same layer as the connecting electrode (195). The pixel electrode (191) and the connecting electrode (195) may include the same material and may be formed together in the same process. The pixel electrode (191) may overlap with the upper holding electrode (1154). The protective layer (180) may include a third opening (1184) that overlaps with the pixel electrode (191) and the upper holding electrode (1154). The pixel electrode (191) may be connected to the upper holding electrode (1154) through the third opening (1184).

[0073] A pixel defining layer (350) may be located on the fourth conductive layer. The pixel defining layer (350) may include a pixel opening (351). The pixel opening (351) may overlap with the pixel electrode (191).

[0074] A light-emitting layer (370) may be located on the pixel definition layer (350), and the light-emitting layer (370) may be located within the pixel opening (351). Within the pixel opening (351), the light-emitting layer (370) may come into contact with the pixel electrode (191). That is, within the pixel opening (351), the light-emitting layer (370) may be located directly above the pixel electrode (191).

[0075] A common electrode (270) may be positioned on the light-emitting layer (370). The common electrode (270) may be in contact with the light-emitting layer (370) and may be positioned directly above the light-emitting layer (370). Within the pixel opening (351), the pixel electrode (191), the light-emitting layer (370), and the common electrode (270) may be stacked in order to form a light-emitting diode (ED). At this time, the pixel electrode (191) may be the anode, and the common electrode (270) may be the cathode.

[0076] The arrangement of the fourth conductive layer of a display device according to one embodiment will be described below with reference to FIG. 8.

[0077] FIG. 8 is a plan view showing a portion of a layer of a display device according to one embodiment. FIG. 8 shows a fourth conductive layer.

[0078] A display device according to one embodiment may include a plurality of pixels (PX1, PX2, PX3) and may include pixel electrodes (191a, 191b, 191c) for each pixel. The plurality of pixels (PX1, PX2, PX3) may include a first pixel (PX1), a second pixel (PX2), and a third pixel (PX3). The first pixel (PX1), the second pixel (PX2), and the third pixel (PX3) may display different colors. For example, the first pixel (PX1) may be a pixel that displays red, the second pixel (PX2) may be a pixel that displays green, and the third pixel (PX3) may be a pixel that displays blue. However, the colors displayed by the first pixel (PX1), the second pixel (PX2), and the third pixel (PX3) are not limited thereto and may be changed in various ways. A first pixel electrode (191a) may be located at the first pixel (PX1), a second pixel electrode (191b) may be located at the second pixel (PX2), and a third pixel electrode (191c) may be located at the third pixel (PX3). The first pixel electrode (191a), the second pixel electrode (191b), and the third pixel electrode (191c) may be arranged adjacent to each other. For example, the second pixel electrode (191b) may be located to the right of the first pixel electrode (191a), and the third pixel electrode (191c) may be located to the right of the second pixel electrode (191b).

[0079] One connecting electrode (195) may be placed for every three pixels (PX1, PX2, PX3). For example, the connecting electrode (195) may be located in the area between the first pixel (PX1) and the third pixel (PX3). The connecting electrode (195) may be adjacent to the first pixel electrode (191a) and the third pixel electrode (191c). The connecting electrode (195) may be located above the first pixel electrode (191a) and to the right of the third pixel electrode (191c) on a plane. However, this is merely an example, and the number of connecting electrodes (195) may be further reduced or increased, and their positions may be varied.

[0080] Hereinafter, a display device according to a comparative example will be described with reference to FIGS. 9 and FIGS. 10.

[0081] FIG. 9 is a plan view showing a part of a display device according to a comparative example, and FIG. 10 is a cross-sectional view along line XX of FIG. 9.

[0082] As illustrated in FIGS. 9 and 10, a display device according to a comparative example includes a substrate (110), a common voltage line (170) located on the substrate (110), a protective layer (180) located on the common voltage line (170), a connecting electrode (195) located on the protective layer (180), a pixel defining layer (350) located on the connecting electrode (195), a light-emitting layer (370) located on the pixel defining layer (350), and a common electrode (270) located on the light-emitting layer (370).

[0083] The protective layer (180) includes a sixth opening (1182), and the connecting electrode (195) can be connected to the common voltage line (170) through the sixth opening (1182). In the display device according to the comparative example, the protective layer (180) does not include a first opening. The pixel defining layer (350) includes a first opening (1350), and the common electrode (270) can be connected to the connecting electrode (270) through the first opening (1350). In the display device according to the comparative example, the pixel defining layer (350) does not include a second opening.

[0084] In a display device according to one embodiment, a second opening (1180) of the protective layer (180) is formed to surround a first opening (1350) of the pixel defining layer (350). In a display device according to a comparative example, an opening of the protective layer (180) is not formed around the first opening (1350) of the pixel defining layer (350). Additionally, in a display device according to one embodiment, a third opening (1195) of the connecting electrode (195) and a fourth opening (1352) of the pixel defining layer (350) are formed within the area surrounded by the second opening (1180) of the protective layer (180), and the third opening (1195) of the connecting electrode (195) and the fourth opening (1352) of the pixel defining layer (350) overlap each other. In the display device according to the comparative example, no opening is formed in the connecting electrode (195), and therefore there is no overlapping portion between the opening of the pixel definition layer and the opening of the connecting electrode.

[0085] There are differences in effect depending on the structural differences between the display device according to the comparative example and the display device according to one embodiment, and these differences will be further explained below with reference to FIGS. 11 to 16.

[0086] FIGS. 11 to 13 are drawings showing the movement path of a gas generated in a display device according to a comparative example, and FIGS. 14 to 16 are drawings showing the movement path of a gas generated in a display device according to one embodiment. FIGS. 11, 13, 14, and 16 are plan views, and FIGS. 12 and 15 are cross-sectional views.

[0087] As illustrated in FIGS. 11 to 13, in a display device according to a comparative example, after forming a light-emitting layer (370) on a pixel defining layer (350), if a laser is irradiated onto a portion corresponding to the first opening (1350) of the pixel defining layer (350), the portion of the light-emitting layer (370) located within the first opening (1350) of the pixel defining layer (350) can be removed. This laser drilling process is carried out at a high temperature, and gas may be generated in the protective layer (180) located below the portion where the laser is irradiated. At this time, gas may be generated in the second protective layer (180b) made of an organic insulating material among the protective layers (180). The generated gas may move along the second protective layer (180b). The gas may move in all directions centered on the portion where the laser is irradiated. The gas may reach the pixels (PX1, PX2, PX3) located around the portion where the laser is irradiated. Pixel electrodes (191a, 191b, 191c) may be located for each pixel (PX1, PX2, PX3), and a light-emitting layer (370) is located on the pixel electrodes (191a, 191b, 191c). The light-emitting layer (370) may come into contact with the pixel electrodes (191a, 191b, 191c). Gas that has moved to each pixel (PX1, PX2, PX3) may affect the light-emitting layer (370) of each pixel (PX1, PX2, PX3), and defects such as deterioration of the light-emitting layer (370) may occur.

[0088] As illustrated in FIGS. 14 to 16, in a display device according to one embodiment, after forming a light-emitting layer (370) on a pixel defining layer (350), a laser drilling process is performed, and a portion of the light-emitting layer (370) located within the first opening (1350) of the pixel defining layer (350) can be removed. During this process, gas may be generated in the protective layer (180), particularly in the second protective layer (180b) made of an organic insulating material. The generated gas moves along the second protective layer (180b) but is blocked by a connecting electrode (195) and cannot move to another adjacent element. In a display device according to one embodiment, a second opening (1180) is formed in the protective layer (180), and the second opening (1180) surrounds the first opening (1350) of the pixel defining layer (350). A connecting electrode (195) is located within the second opening (1180) of the protective layer (180), and the connecting electrode (195) is formed to cover the side of the protective layer (180) within the second opening (1180). Accordingly, the portion of the second protective layer (180b) surrounded by the second opening (1180) and the portion of the second protective layer (180b) located outside the second opening (1180) can be separated by the connecting electrode (195). Gas generated in the portion of the second protective layer (180b) surrounded by the second opening (1180) is blocked by the connecting electrode (195) and cannot move to the portion of the second protective layer (180b) located outside the second opening (1180). Therefore, the gas cannot reach the pixels (PX1, PX2, PX3) located around the part where the laser was irradiated, and cannot affect the light-emitting layer (370) of each pixel (PX1, PX2, PX3), and can prevent defects from occurring in the light-emitting layer (370).

[0089] Additionally, in a display device according to one embodiment, a third opening (1195) of a connecting electrode (195) and a fourth opening (1352) of a pixel defining layer (350) are formed within an area surrounded by a second opening (1180) of a protective layer (180). The third opening (1195) of the connecting electrode (195) and the fourth opening (1352) of the pixel defining layer (350) overlap each other, and gas blocked by the connecting electrode (195) can escape to the outside through the third opening (1195) of the connecting electrode (195) and the fourth opening (1352) of the pixel defining layer (350). That is, by releasing the gas generated in the protective layer (180) during the laser drilling process to the outside, the impact on other components can be minimized.

[0090] Next, referring to FIG. 17, a display device according to one embodiment is described as follows.

[0091] Since the display device according to the embodiment illustrated in FIG. 17 has a substantial number of parts identical to the display device according to the embodiments illustrated in FIG. 1 to 8, the description of the identical parts is omitted. This embodiment differs from the previous embodiment in that the second opening (1180) of the protective layer (180) is formed not only in the second protective layer (180b) but also in the first protective layer (180a), and will be explained further below.

[0092] FIG. 17 is a cross-sectional view showing a display device according to one embodiment.

[0093] As illustrated in FIG. 17, a display device according to one embodiment includes a substrate (110), a common voltage line (170) located on the substrate (110), a protective layer (180) located on the common voltage line (170), a connecting electrode (195) located on the protective layer (180), a pixel defining layer (350) located on the connecting electrode (195), a light-emitting layer (370) located on the pixel defining layer (350), and a common electrode (270) located on the light-emitting layer (370).

[0094] The protective layer (180) may include a second opening (1180) and a sixth opening (1182). In the preceding embodiment, the second opening (1180) may be formed only in the second protective layer (180b) and not in the first protective layer (180a). In this embodiment, the second opening (1180) may be formed in both the first protective layer (180a) and the second protective layer (180b). At this time, the depth of the second opening (1180) may correspond to the thickness of the protective layer (180), and by forming the second opening (1180), a portion of the common voltage line (170) overlapping with the second opening (1180) may be exposed. A common electrode (270) may be located within the second opening (1180) of the protective layer (180), and the common electrode (270) may be connected to a common voltage line (170) through the second opening (1180). Additionally, the common electrode (270) may be connected to a common voltage line (170) through a sixth opening (1182). Accordingly, according to the present embodiment, the area of ​​the portion where the common electrode (270) and the common voltage line (170) are connected may be increased compared to the previous embodiment, and the resistance of the common electrode (270) may be further reduced. Furthermore, since the second opening (1180) and the sixth opening (1182) can be formed simultaneously using the same mask, the process can be simplified and costs can be reduced.

[0095] Although the protective layer (180) has been described above as including a second opening (1180) and a sixth opening (1182), it is not limited thereto. Depending on the case, the sixth opening (1182) may be omitted. Since the connection between the common electrode (270) and the common voltage line (170) is made through the second opening (1180), the sixth opening (1182) may be omitted. This allows the area occupied by the connecting electrode (195) to be reduced, and makes high-resolution design easier.

[0096] Next, a display device according to one embodiment will be described with reference to FIGS. 18 and FIGS. 19 as follows.

[0097] Since the display device according to the embodiment illustrated in FIGS. 18 and 19 has a substantial number of parts identical to the display device according to the embodiment illustrated in FIGS. 1 to 8, the description of the identical parts is omitted. This embodiment differs from the previous embodiment in that a third opening (1195) is not formed in the connecting electrode (195), and will be explained further below.

[0098] FIG. 18 is a plan view showing a part of a display device according to one embodiment, and FIG. 19 is a cross-sectional view along line XIX-XIX of FIG. 18.

[0099] As illustrated in FIGS. 18 and 19, a display device according to one embodiment includes a substrate (110), a common voltage line (170) located on the substrate (110), a protective layer (180) located on the common voltage line (170), a connecting electrode (195) located on the protective layer (180), a pixel defining layer (350) located on the connecting electrode (195), a light-emitting layer (370) located on the pixel defining layer (350), and a common electrode (270) located on the light-emitting layer (370).

[0100] The protective layer (180) may include a second opening (1180) and a sixth opening (1182), and the connecting electrode (195) may be located within the second opening (1180) and the sixth opening (1182). In the preceding embodiment, the connecting electrode (195) may include a third opening (1195). In this embodiment, no opening may be formed in the connecting electrode (195). In the preceding embodiment, the second opening (1180) of the protective layer (180) may overlap with the approximately octagonal portion of the connecting electrode (195) and the surrounding area. In this embodiment, the second opening (1180) of the protective layer (180) may overlap only with the approximately octagonal portion of the connecting electrode (195).

[0101] The pixel definition layer (350) may include a first opening (1350). In the preceding embodiment, the pixel definition layer (350) may include a first opening (1350) and a fourth opening (1352). In this embodiment, the pixel definition layer (350) may include a first opening (1350) and may not include a fourth opening (1352).

[0102] In this embodiment, gas generated in the portion of the second protective layer (180b) surrounded by the second opening (1180) is blocked by the connecting electrode (195) and cannot move to the portion of the second protective layer (180b) located outside the second opening (1180). Therefore, it is possible to prevent the gas from affecting pixels located around the portion where the laser was irradiated.

[0103] In this embodiment, since no opening is formed in the connecting electrode (195), the gas generated in the protective layer (180) is not released to the outside and can be trapped within the second protective layer (180b) surrounded by the second opening (1180).

[0104] Next, a display device according to one embodiment will be described with reference to FIGS. 20 and FIGS. 21 as follows.

[0105] Since the display device according to the embodiment illustrated in FIGS. 20 and 21 has a significant number of parts identical to the display device according to the embodiment illustrated in FIGS. 1 to 8, the description of the identical parts is omitted. This embodiment differs from the previous embodiment in that a second opening (1180) is not formed in the protective layer (180) and in the shape of the third opening (1195) of the connecting electrode (195), and will be explained further below.

[0106] FIG. 20 is a plan view showing a part of a display device according to one embodiment, and FIG. 21 is a cross-sectional view along the line XXI-XXI of FIG. 20.

[0107] As illustrated in FIGS. 20 and 21, a display device according to one embodiment includes a substrate (110), a common voltage line (170) located on the substrate (110), a protective layer (180) located on the common voltage line (170), a connecting electrode (195) located on the protective layer (180), a pixel defining layer (350) located on the connecting electrode (195), a light-emitting layer (370) located on the pixel defining layer (350), and a common electrode (270) located on the light-emitting layer (370).

[0108] The protective layer (180) may include a sixth opening (1182), and the connecting electrode (195) may be connected to the common voltage line (170) through the sixth opening (1182). In the preceding embodiment, the protective layer (180) may further include a second opening (1180). In this embodiment, the protective layer (180) may not include a first opening. An opening may not be formed in the protective layer (180) to surround the first opening (1350) of the pixel definition layer (350), and the area around the part where the laser is irradiated may not be blocked by the connecting electrode (195).

[0109] In this embodiment, the connecting electrode (195) may include a fifth opening (1197). The fifth opening (1197) may be formed to surround at least a portion of the first opening (1350) of the pixel defining layer (350). The fifth opening (1197) of the connecting electrode (195) is not formed to surround the entire first opening (1350) of the pixel defining layer (350). For example, the fifth opening (1197) of the connecting electrode (195) may be formed to surround about 50% or more and about 90% or less of the first opening (1350) of the pixel defining layer (350). When the first opening (1350) of the pixel definition layer (350) is formed in a planar shape approximately octagonal, seven sides are surrounded by the fifth opening (1197) of the connecting electrode (195), and the remaining one side may not be surrounded by the fifth opening (1197) of the connecting electrode (195). When the fifth opening (1197) of the connecting electrode (195) is formed to surround the entire first opening (1350) of the pixel definition layer (350), the part of the connecting electrode (195) located inside the fifth opening (1197) and the part of the connecting electrode (195) located outside the fifth opening (1197) may not be connected to each other. Accordingly, the fifth opening (1197) is formed in an open loop shape rather than a closed loop shape so that the part of the connecting electrode (195) located inside the fifth opening (1197) and the part of the connecting electrode (195) located outside the fifth opening (1197) can be connected to each other. However, this is not limited thereto, and the fifth opening (1197) may also be formed in a closed loop shape. At this time, a bridge electrode may be separately formed to connect the part of the connecting electrode (195) located inside the fifth opening (1197) and the part of the connecting electrode (195) located outside the fifth opening (1197).

[0110] The fifth opening (1197) of the connecting electrode (195) does not overlap with the first opening (1350) of the pixel defining layer (350). The fifth opening (1197) of the connecting electrode (195) may be covered by the pixel defining layer (350). At this time, the fifth opening (1197) of the connecting electrode (195) may be entirely covered by the pixel defining layer (350). Thus, the connecting electrode (195) can be protected by preventing the side of the connecting electrode (195) from being exposed.

[0111] In a display device according to one embodiment, the connecting electrode (195) includes a fifth opening (1197) that surrounds at least a portion of the first opening (1350) of the pixel definition layer (350), so that gas generated in the protective layer (180) during the laser drilling process can be discharged to the outside through the fifth opening (1197) of the connecting electrode (195). Accordingly, it is possible to prevent the gas generated in the protective layer (180) from moving to adjacent pixels (PX1, PX2, PX3). That is, by discharging the gas generated in the protective layer (180) during the laser drilling process to the outside, the impact on other elements can be minimized.

[0112] Next, the cross-sectional structure of a display device according to one embodiment will be further described with reference to FIG. 22. The description will be made in conjunction with FIGS. 1 through 8, which were previously described. In FIG. 7, it was previously described that the common electrode is located in the uppermost layer. Other layers may be located above the common electrode, which will be further described below.

[0113] FIG. 22 is a cross-sectional view illustrating some components of a display device according to one embodiment. FIG. 22 illustrates some components, such as a pixel electrode, a light-emitting layer, and a common electrode, while omitting the illustration of the first to third conductive layers, etc., of the display device according to one embodiment illustrated in FIG. 7. FIG. 22 further illustrates another layer located on the common electrode.

[0114] As illustrated in FIG. 22, a display device according to one embodiment may include a plurality of pixels (PX1, PX2, PX3). Pixel electrodes (191a, 191b, 191c) may be located on the substrate (110) for each pixel (PX1, PX2, PX3). A plurality of transistors and insulating layers, etc. located between the substrate (110) and the pixel electrodes (191a, 191b, 191c) are omitted from the illustration.

[0115] A pixel defining layer (350) may be located on the pixel electrodes (191a, 191b, 191c), and the pixel defining layer (350) may include a pixel opening (351). A light-emitting layer (370) may be located on the pixel electrodes (191a, 191b, 191c) and the pixel defining layer (350), and a common electrode (270) may be located on the light-emitting layer (370). The light-emitting layer (370) may include a light-emitting material that emits a first color light, which may be blue light.

[0116] A sealing layer (380) comprising a plurality of insulating layers (381, 382, ​​383) may be positioned on the common electrode (270). The insulating layer (381) and the insulating layer (382) may include an inorganic insulating material, and the insulating layer (382) positioned between the insulating layer (381) and the insulating layer (382) may include an organic insulating material.

[0117] A filling layer (390) containing a filler may be positioned on top of the sealing layer (380). On top of the filling layer (390), a cover layer (400) containing an insulating material, and a plurality of color-changing layers (430a, 430b) and a transparent layer (430c) may be positioned.

[0118] The transparent layer (430c) can transmit incident light. That is, the transparent layer (430c) can transmit first color light, which may be blue light. The transparent layer (430c) may include a polymer material that transmits the first color light. The region where the transparent layer (430c) is located may correspond to a light-emitting region that emits blue light, and the transparent layer (430c) can transmit the incident first color light as is without including a separate semiconductor nanocrystal.

[0119] The color conversion layers (430a, 430b) may include different semiconductor nanocrystals. For example, a first color light incident on the color conversion layer (430a) may be converted into a second color light and emitted by the semiconductor nanocrystal included in the color conversion layer (430b). A first color light incident on the color conversion layer (430b) may be converted into a third color light and emitted by the semiconductor nanocrystal included in the color conversion layer (430b).

[0120] The semiconductor nanocrystal may include at least one of a phosphor and a quantum dot material that converts incident first-color light into second-color light or third-color light.

[0121] The core of the quantum dot can be selected from group II-VI compounds, group III-V compounds, group IV-VI compounds, group IV elements, group IV compounds, and combinations thereof.

[0122] Group II-VI compounds are diatomic compounds selected from the group consisting of CdSe, CdTe, ZnS, ZnSe, ZnTe, ZnO, HgS, HgSe, HgTe, MgSe, MgS, and mixtures thereof; ternary compounds selected from the group consisting of AgInS, CuInS, CdSeS, CdSeTe, CdSTe, ZnSeS, ZnSeTe, ZnSTe, HgSeS, HgSeTe, HgSTe, CdZnS, CdZnSe, CdZnTe, CdHgS, CdHgSe, CdHgTe, HgZnS, HgZnSe, HgZnTe, MgZnSe, MgZnS, and mixtures thereof; and may be selected from the group consisting of four-element compounds selected from the group consisting of HgZnTeS, CdZnSeS, CdZnSeTe, CdZnSTe, CdHgSeS, CdHgSeTe, CdHgSTe, HgZnSeS, HgZnSeTe, HgZnSTe and mixtures thereof.

[0123] III-V compounds may be selected from the group consisting of diatomic compounds selected from GaN, GaP, GaAs, GaSb, AlN, AlP, AlAs, AlSb, InN, InP, InAs, InSb, and mixtures thereof; ternary compounds selected from the group consisting of GaNP, GaNAs, GaNSb, GaPAs, GaPSb, AlNP, AlNAs, AlNSb, AlPAs, AlPSb, InGaP, InNP, InNAs, InNSb, InPAs, InPSb, GaAlNP, and mixtures thereof; and quaternary compounds selected from the group consisting of GaAlNAs, GaAlNSb, GaAlPAs, GaAlPSb, GaInNP, GaInNAs, GaInNSb, GaInPAs, GaInPSb, InAlNP, InAlNAs, InAlNSb, InAlPAs, InAlPSb, and mixtures thereof.

[0124] Group IV-VI compounds may be selected from the group consisting of SnS, SnSe, SnTe, PbS, PbSe, PbTe, and mixtures thereof; ternary compounds selected from the group consisting of SnSeS, SnSeTe, SnSTe, PbSeS, PbSeTe, PbSTe, SnPbS, SnPbSe, SnPbTe, and mixtures thereof; and quaternary compounds selected from the group consisting of SnPbSSe, SnPbSeTe, SnPbSTe, and mixtures thereof. Group IV elements may be selected from the group consisting of Si, Ge, and mixtures thereof. Group IV compounds may be ternary compounds selected from the group consisting of SiC, SiGe, and mixtures thereof.

[0125] In this case, the binary, ternary, or quaternary compounds may exist within the particle at a uniform concentration, or they may exist within the same particle with concentration distributions partially divided into different states. Additionally, the structure may have a core / shell configuration where one quantum dot surrounds another. The interface between the core and the shell may have a concentration gradient in which the concentration of the element present in the shell decreases towards the center.

[0126] In some embodiments, the quantum dot may have a core-shell structure comprising a core containing the aforementioned nanocrystal and a shell surrounding the core. The shell of the quantum dot may serve as a protective layer to maintain semiconductor properties by preventing chemical degradation of the core and / or as a charging layer to impart electrophoretic properties to the quantum dot. The shell may be a single layer or a multilayer. The interface between the core and the shell may have a concentration gradient in which the concentration of elements present in the shell decreases toward the center. Examples of the shell of the quantum dot include oxides of metals or non-metals, semiconductor compounds, or combinations thereof.

[0127] For example, the oxide of the metal or nonmetal mentioned above may be exemplified as a binary compound such as SiO2, Al2O3, TiO2, ZnO, MnO, Mn2O3, Mn3O4, CuO, FeO, Fe2O3, Fe3O4, CoO, Co3O4, NiO, or a ternary compound such as MgAl2O4, CoFe2O4, NiFe2O4, CoMn2O4, but the present invention is not limited thereto.

[0128] In addition, the above semiconductor compounds may be examples of CdS, CdSe, CdTe, ZnS, ZnSe, ZnTe, ZnSeS, ZnTeS, GaAs, GaP, GaSb, HgS, HgSe, HgTe, InAs, InP, InGaP, InSb, AlAs, AlP, AlSb, etc., but the present invention is not limited thereto.

[0129] Quantum dots can have a full width of half maximum (FWHM) of the emission wavelength spectrum of about 45 nm or less, preferably about 40 nm or less, and more preferably about 30 nm or less, and color purity or color reproducibility can be improved in this range. In addition, since the light emitted through these quantum dots is emitted in all directions, the viewing angle can be improved.

[0130] In addition, the shape of the quantum dots is not specifically limited to shapes commonly used in the field, but more specifically, shapes such as spherical, pyramidal, multi-arm, or cubic nanoparticles, nanotubes, nanowires, nanofibers, and nanoplate particles may be used.

[0131] Quantum dots can control the color of the light they emit depending on their particle size, and accordingly, they can have various emission colors such as blue, red, and green.

[0132] An insulating layer (440) may be positioned on a plurality of color conversion layers (430a, 430b) and a transparent layer (430c), and a plurality of color filters (450a, 450b, 450c) and a light-blocking member (460) may be positioned thereon.

[0133] The color filter (450a) can represent second color light, the color filter (450b) can represent third color light, and the color filter (450c) can represent first color light.

[0134] The light-blocking member (460) can be located between adjacent color filters (450a, 450b, 450c).

[0135] A substrate (210) may be positioned on a plurality of color filters (450a, 450b, 450c) and a light-blocking member (460). That is, a plurality of color conversion layers (430a, 430b) and a plurality of color filters (450a, 450b, 450c) may be positioned between the substrate (110) and the substrate (210).

[0136] According to another embodiment of the present invention, instead of including a plurality of color conversion layers (430a, 430b) and a transmission layer (430c), the light-emitting layer (370) may include quantum dots.

[0137] Although embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements by those skilled in the art using the basic concept of the present invention as defined in the following claims also fall within the scope of the present invention. Explanation of the symbols

[0138] 110: Substrate 170: Common voltage line 180: Protection layer 180a: First protective layer 180b: Second layer of protection 1180: Second opening 1182: 6th opening 195: Connecting electrode 1195: Third opening 1197: Fifth opening 270: Common electrode 350: Pixel definition layer 1350: First opening 1352: The fourth opening 370: Emissive layer

Claims

Claim 1 A display device comprising a substrate, a common voltage line located on the substrate, a protective layer located on the common voltage line, a connecting electrode located on the protective layer and connected to the common voltage line, a pixel defining layer located on the connecting electrode and having a side defining a first opening, a light-emitting layer located on the pixel defining layer, and a common electrode located on the light-emitting layer and connected to the connecting electrode through the first opening, wherein the protective layer has a second opening surrounding the first opening and not overlapping with the first opening. Claim 2 A display device according to claim 1, wherein the connecting electrode is located within the second opening. Claim 3 In paragraph 2, the connecting electrode is a display device covering the side of the protective layer within the second opening. Claim 4 In paragraph 3, a display device in which the portion of the protective layer surrounded by the second opening and the portion of the protective layer located outside the second opening are separated by the connecting electrode. Claim 5 In paragraph 2, the second opening is a display device having a closed-loop shape in a planar shape. Claim 6 delete Claim 7 In paragraph 2, the display device comprises a first protective layer comprising an inorganic insulating material, and a second protective layer located on the first protective layer and comprising an organic insulating material. Claim 8 In claim 7, the second opening is formed in the second protective layer and not in the first protective layer. Claim 9 In claim 7, the second opening is a display device formed in the first protective layer and the second protective layer. Claim 10 In claim 9, the connecting electrode is a display device connected to the common voltage line through the second opening. Claim 11 In paragraph 2, the connecting electrode includes a third opening, and the third opening is surrounded by the second opening. Claim 12 In paragraph 11, the third opening is a display device that overlaps with the portion of the protective layer surrounded by the second opening. Claim 13 In claim 11, the pixel defining layer further comprises a fourth opening that overlaps with the third opening. Claim 14 In paragraph 13, a display device in which the planar size of the fourth opening is smaller than the planar size of the third opening. Claim 15 In paragraph 14, the pixel defining layer is a display device covering the side of the connecting electrode within the third opening. Claim 16 In claim 1, the light-emitting layer is not located in at least a portion of the first opening in the display device. Claim 17 A display device comprising a substrate, a common voltage line located on the substrate, a protective layer located on the common voltage line, a connecting electrode located on the protective layer and connected to the common voltage line, a pixel defining layer located on the connecting electrode and including a first opening, a light-emitting layer located on the pixel defining layer, and a common electrode located on the light-emitting layer and connected to the connecting electrode through the first opening, wherein the connecting electrode includes a fifth opening, and the fifth opening surrounds the first opening. Claim 18 In paragraph 17, the above-mentioned fifth opening is a display device covered by the pixel definition layer. Claim 19 In paragraph 17, the fifth opening is a display device having an open-loop shape in a planar view. Claim 20 In paragraph 17, the first opening is a display device that does not overlap with the fifth opening.

Images