DISPLAY DEVICE

Abstract

One embodiment of the present disclosure provides a display device comprising a substrate, a first electrode arranged on the substrate and comprising an upper electrode and a lower electrode, a light-emitting layer on the first electrode and a second electrode on the light-emitting layer, wherein the lower electrode comprises a protruding part and a concave part arranged at a different height than the protruding part and wherein the protruding part is spaced apart from the upper electrode.

Description

[0001] This application claims the priority benefit of Korean patent application No. 10-2024-0114907, which was filed on August 27, 2024. Technical field

[0002] The present disclosure relates to a display device. Discussion of related technology

[0003] With the development of the information society, the demand for display devices for showing images in various formats is increasing. Accordingly, various display devices such as liquid crystal displays (LCDs), plasma display boards (PDPs), and organic light-emitting displays (OLEDs) have recently been used.

[0004] Among display devices, organic light-emitting displays (OLEDs) are self-illuminating, offer excellent viewing angles and contrast ratios compared to liquid crystal displays (LCDs), do not require separate backlighting (making them lightweight and thin), and have the advantage of low power consumption. Furthermore, OLEDs can be driven with low DC voltage, have a fast response time, and offer the advantage of low manufacturing costs.

[0005] An organic light-emitting display device has a structure in which an organic light-emitting element with a light-emitting layer is positioned between a cathode, which injects electrons, and an anode, which injects holes. An organic light-emitting display device is a display device that utilizes the principle that when electrons generated by the cathode and holes generated by the anode are injected into the light-emitting layer, the injected electrons and holes combine to produce excitons, and the generated excitons decay from an excited state to a ground state to emit light.

[0006] To solve the problem regarding the power consumption of the subpixels of the display device, the light emission efficiency of each subpixel is increased; however, this can lead to the problem that the user's visual perception is impaired, as light entering from outside the display device is reflected by wiring and electrodes inside the display device and perceived by the user. SUMMARY

[0007] The object of the invention is to provide a display device that improves the luminous efficiency to the outside and suppresses the reflection of external light, thereby improving the user's viewing experience.

[0008] To solve the above-mentioned problem, the present disclosure provides a display device comprising a substrate, a first electrode arranged on the substrate and comprising an upper electrode and a lower electrode, a light-emitting layer on the first electrode and a second electrode on the light-emitting layer, wherein the lower electrode comprises a protruding part and a concave part arranged at a different height than the protruding part and wherein the protruding part is spaced apart from the upper electrode.

[0009] Furthermore, the disclosure includes a display device comprising a substrate comprising a first subpixel, a first electrode comprising a first upper electrode and a first lower electrode, a first light-emitting layer on the first electrode and a second electrode on the first light-emitting layer, wherein the first subpixel is arranged on the substrate, wherein the first lower electrode has a first protruding part and a first concave part arranged at a different height than the first protruding part, and wherein the first protruding part is spaced apart from the first upper electrode.

[0010] Furthermore, the disclosure includes a display device comprising a substrate, an upper electrode and a lower electrode arranged on the substrate, and an insulating layer arranged below the lower electrode, wherein the lower electrode has a protruding part, a concave part arranged at a different height than the protruding part, and an open part arranged in the protruding part and / or the concave part, exposing a section of an upper surface of the insulating layer.

[0011] In one or more embodiments, the lower electrode may further have an inclined part that is arranged between the protruding part and the concave part.

[0012] In one or more embodiments, the upper electrode can be a transparent electrode and / or the lower electrode can be a reflective electrode.

[0013] In one or more embodiments, the upper electrode can have a different shape than the lower electrode.

[0014] In one or more embodiments, an upper surface of the upper electrode can be planar.

[0015] In one or more embodiments, the distance between the protruding part of the lower electrode and the second electrode can be such that a microcavity is formed for red R, green G and blue B light.

[0016] In one or more embodiments, the distance between the concave part of the lower electrode and the second electrode can be such that the microcavity for red R, green G and blue B light is formed.

[0017] In one or more embodiments, the distance between the concave part of the lower electrode and the second electrode can be such that the microcavity for further light from red R, green G and blue B light is formed.

[0018] In one or more embodiments, the lower electrode may further have a second projecting part which is arranged at a height that differs from that of the projecting part and the concave part.

[0019] In one or more embodiments, the distance between the second projecting part and the light-emitting layer can be such that the microcavity forms for yet another light consisting of red R, green G and blue B light.

[0020] In one or more embodiments, the display device may further comprise several open parts arranged in one of the protruding part and the concave part.

[0021] In one or more embodiments, the display device may further comprise an insulating layer arranged below the lower electrode and having the same shape as the lower electrode.

[0022] In one or more embodiments, the insulating layer can have a first part with a first height and a second part with a second height.

[0023] In one or more embodiments, the multiple open parts can expose a section of an upper surface of either the first part or the second part.

[0024] In one or more embodiments, the display device may further comprise a planarization layer arranged between the upper electrode and the lower electrode to planarize a lower surface of the upper electrode.

[0025] In one or more embodiments, the planarization layer can have a contact hole that electrically connects the upper electrode and the lower electrode.

[0026] In one or more embodiments, the first subpixel can comprise a 1-1 subpixel and a 1-2 subpixel that display the same color.

[0027] In one or more embodiments, the first lower electrode located in the 1-1 subpixel and the first lower electrode located in the 1-2 subpixel can be arranged consecutively.

[0028] In one or more embodiments, the first upper electrode located in the 1-1 subpixel and the first upper electrode located in the 1-2 subpixel can be spaced apart from each other.

[0029] In one or more embodiments, an upper surface of the first lower electrode can be exposed through a distance range between the first upper electrode of the 1-1 subpixel and the first upper electrode of the 1-2 subpixel.

[0030] In one or more embodiments, the display device may further comprise a second subpixel that displays a different color than the first subpixel.

[0031] In one or more embodiments, the second subpixel can include a third electrode arranged on the substrate and comprising a second upper electrode and a second lower electrode; a second light-emitting layer on the third electrode; and a fourth electrode on the second light-emitting layer.

[0032] In one or more embodiments, the second lower electrode may have a second projecting part and a second concave part that is arranged at a different height than the second projecting part.

[0033] In one or more embodiments, the second projecting part can be spaced apart from the second upper electrode.

[0034] In one or more embodiments, the distance between the second light-emitting layer and the second projecting part can be equal to the distance between the first light-emitting layer and either the first projecting part or the first concave part.

[0035] In one or more embodiments, a distance between the first projecting part of the first lower electrode, which is arranged in the first subpixel, and the first light-emitting layer, and a distance between the first concave part and the first light-emitting layer can be distances at which a microcavity is formed for light of red R, green G and blue B light.

[0036] In one or more embodiments, a distance between the second projecting part of the second lower electrode, which is arranged in the second subpixel, and the second light-emitting layer can be a distance at which a microcavity is formed for light consisting of red R, green G and blue B light.

[0037] In one or more embodiments, a distance between the second concave part of the second lower electrode, which is arranged in the second subpixel, and the second light-emitting layer can be a distance at which a microcavity is formed for further light from red R, green G and blue B light.

[0038] In one or more embodiments, the second subpixel may further comprise a third projecting part which is arranged at a height that differs from that of the second projecting part and the second concave part.

[0039] In one or more embodiments, the distance between the third projecting part and the second light-emitting layer can be such that a microcavity is formed for yet another light consisting of red R, green G and blue B light.

[0040] In one or more embodiments, the first subpixel displays a color of red R, green G and blue B, and the second subpixel displays white W.

[0041] In one or more embodiments, a shortest distance between an upper surface of the first lower electrode and a lower surface of the first upper electrode can be equal to a shortest distance between an upper surface of the second lower electrode and a lower surface of the second upper electrode.

[0042] In one or more embodiments, the display device may further comprise an inclined part that is arranged between the protruding part and the concave part.

[0043] In one or more embodiments, the open part can be formed by removing part of the lower electrode. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] The above-mentioned and other tasks, features, and advantages of the revelation are better understood through the following detailed description in conjunction with the accompanying drawings; they show: Fig. 1 a schematic perspective view of a display device of an embodiment of the disclosure; Fig. 2 a top view schematically showing a display device of an embodiment of the disclosure; Fig. 3 a top view of a display device of an embodiment of the disclosure, wherein in this case Fig. 3 an enlarged view of area A from Fig. 2 is; Fig. 4 a cross-sectional view of a display device of an embodiment of the disclosure, wherein in this case Fig. 4 a cross-section II' of Fig. 3 corresponds to; Fig. 5 a cross-sectional view of a display device of an embodiment of the present disclosure, wherein in this case Fig. 5 an enlarged view of area B of Fig. 4 is; Fig. 6 a top view schematically showing an upper electrode and a lower electrode of an embodiment of the disclosure; Fig. 7 a cross-sectional view of a display device of a further embodiment of the disclosure, wherein in this case x Fig. 7 the cross-section II' of Fig. 3 corresponds to; Fig. 8 a top view schematically showing an upper electrode and a lower electrode of a further embodiment of the disclosure; Fig. 9 a cross-sectional view of a display device of an embodiment of the disclosure, wherein in this case Fig. 9 the cross-section II-II' of Fig. 3 corresponds to; Fig. 10A a top view of a display device of a further embodiment of the disclosure, wherein in this case Fig. 10A an enlarged view of area A of Fig. 2 is; Fig. 10B an enlarged top view of a display device of a further embodiment of the present disclosure, wherein in this case Fig. 10B an enlarged view of area C from Fig. 10A is; Fig. 11 a cross-sectional view of a display device of a further embodiment of the present disclosure, wherein in this case Fig. 11 from the cross-section III-III' Fig. 10B is equivalent. DETAILED DESCRIPTION

[0045] The advantages and features of the disclosure, as well as the methods for achieving them, will become apparent with reference to the embodiments described in detail below in conjunction with the accompanying drawings. However, the disclosure is not limited to the embodiments disclosed below, but can be implemented in various forms, and these embodiments serve only to complete the disclosure and to fully inform those skilled in the art in the field to which the disclosure belongs about the scope of the invention, the disclosure being defined solely by the scope of the claims.

[0046] The shapes, sizes, ratios, angles, numbers, etc., disclosed in the drawings illustrating the embodiments of the disclosure are exemplary, and therefore the disclosure is not limited to the content shown. The same reference numerals refer to the same elements throughout the description. If, in describing the disclosure, it is determined that a detailed description of a related known technology might unnecessarily obscure the core of the disclosure, the detailed description is omitted. If the terms "comprise," "have," "consist of," etc., are used in this description, other parts may be added unless "only" is used. If a component is expressed in the singular, it also includes the plural unless an explicit and unambiguous description is provided.

[0047] When interpreting a component, it is interpreted in such a way that it encompasses the error range, even if no separate explicit description is provided.

[0048] For example, when describing a positional relationship, if the positional relationship between two parts is described as "on ~", "upper ~", "lower ~", "next to ~", etc., one or more other parts may be located between the two parts unless "immediately" or "directly" is used.

[0049] For example, when describing a temporal relationship, if expressions such as "after", "subsequent", "next" or "before" are used, this can also include cases where there is no continuity, as long as "immediately" or "as soon as" is not used.

[0050] Although the terms "first," "second," etc., are used to describe different components, these components are not limited by these terms. These terms are only used to distinguish one component from another. Accordingly, a first component mentioned below in the technical concept of the disclosure may also be a second component.

[0051] The individual features of the various embodiments of the disclosure can be partially or completely combined or linked together and can be technically interconnected and controlled in various ways, and each embodiment can be implemented independently of others or together with others in a related relationship.

[0052] Preferred embodiments of the disclosure are described in detail below with reference to the drawings.

[0053] Fig. Figure 1 is a schematic perspective view of a display device of an embodiment of the disclosure.

[0054] Fig. Figure 2 is a top view schematically showing a display device of an embodiment of the disclosure.

[0055] Fig. Figure 3 is a top view of a display device of an embodiment of the disclosure. In this case, Fig. 3 an enlarged view of area A from Fig. 2.

[0056] Fig. Figure 1 is a perspective view that schematically shows a display device of an embodiment of the disclosure, and Fig. Figure 2 is a top view schematically showing a display device of an embodiment of the disclosure.

[0057] In the following, the X-axis represents a direction parallel to the scanning line, the Y-axis a direction parallel to the data line, and the Z-axis the vertical direction of the display device 10.

[0058] The display device 10 of an embodiment has been mainly described as an organic light-emitting display, but can also be implemented as a liquid crystal display, plasma display panel (PDP), quantum dot light-emitting display (QLED) or electrophoresis display.

[0059] With reference to Fig. 1 and Fig. 2 comprises a display device 10 of an embodiment, a display panel 100, an integrated source control circuit, hereinafter referred to as “IC” 310, a flexible film 320, a printed circuit board 330, and a timing control unit 340. The printed circuit board 340 can be connected to the display panel via the FPC 320. The integrated source control circuit 310 can be arranged on the FPC 320.

[0060] The display panel 100 comprises the first substrate 100a and the second substrate 100b, which face each other. The second substrate 100b can be a sealing substrate. The first substrate 100a can have as its base a plastic film, a glass substrate, or a silicon wafer substrate formed using a semiconductor process. The second substrate 100b can also be a plastic film, a glass substrate, or a sealing film. Both the first substrate 100a and the second substrate 100b can be made of a transparent material.

[0061] The display board 100 can be divided into a display area DA, in which pixels are configured to display an image, and a non-display area NDA, in which no image is displayed.

[0062] The display area DA can be provided with first signal lines SL1, second signal lines SL2 and pixels, and the non-display area NDA can be provided with a contact point area PA in which contact points are arranged and at least one scanning driver 305.

[0063] The first signal lines SL1 can extend in a first direction, the Y-axis direction, and can intersect the second signal lines SL2 in the display area DA. The second signal lines SL2 can extend in a second direction, the X-axis direction, in the display area DA. The pixels are arranged in an area where the first signal line SL1 is provided, or in an area where the first signal line SL1 and the second signal line SL2 intersect, and emit a predetermined amount of light to display an image.

[0064] The source control IC 310 receives digital video data and a source control signal from the timing control unit 340 or any external device. The source control IC 310 converts the digital video data into analog data voltages according to the source control signal and delivers these to data lines. When the source control IC 310 is manufactured as a driver chip, it can be mounted on the flexible film 320 in a COF (chip-on-film) or COP (chip-on-plastic) configuration.

[0065] The wires connecting the contact points and the source control IC 310, as well as the wires connecting the contact points and the wires of the printed circuit board 330, can be arranged on the flexible film 320. The flexible film 320 is applied to the contact points by means of an anisotropic conductive film, thereby connecting the contact points and the wires of the flexible film 320.

[0066] The printed circuit board 330 can be attached to the flexible films 320. The printed circuit board 330 can have several circuits implemented with control chips mounted on it. For example, the timing control unit 340 can be mounted on the printed circuit board 330. The printed circuit board 330 can be a printed circuit board or a flexible printed circuit board.

[0067] The timing control unit 340 receives digital video data and a timing signal from an external system board (not shown). The timing control unit 340 generates a gate control signal to control the operating time of the scanning control unit based on the timing signal, and a source control signal to control the source control ICs 310. The timing control unit 340 supplies the gate control signal to the scanning control unit 305 and the source control signal to the source control ICs 310.

[0068] Fig. Figure 3 is a top view of a display device of an embodiment. In this case, Fig. 3 an enlarged view of area A from Fig. 2. How it turns out Fig. As can be seen in Figure 3, a display device of one embodiment comprises several pixel areas P, a non-transparent area NTA and several transparent areas TA.

[0069] The multiple transparent areas TA are areas that transmit most of the incoming light, and the non-transparent area NTA and the multiple pixel areas P described above are areas that do not transmit most of the incoming light. In this case, the transmittance in the multiple transparent areas TA described above can be higher than the transmittance in the non-transparent area NTA and the multiple pixel areas P described above. Since the display panel 100 is designed incorporating the multiple transparent areas TA described above, an object or background located on the back of the display panel (see 100 in Fig. 1) be recognized.

[0070] The multiple transparent areas TA can be arranged in a first direction, for example the Y direction, and spaced apart from each other in a second direction, for example the X direction.

[0071] The area of ​​each of the transparent areas TA can be designed to be larger than the area of ​​one of the subpixels SP1, SP2, SP3, SP4 arranged in each of the aforementioned pixel areas P.

[0072] The multiple pixel areas P can be arranged between the multiple transparent areas TA. The multiple pixel areas P can be arranged between the multiple transparent areas TA and emit light.

[0073] Each of the multiple pixel areas P can include the first subpixel SP1 to fourth subpixel SP4, in which light-emitting elements are arranged to emit light.

[0074] The first subpixel, SP1, emits light of a first color, the second subpixel, SP2, emits light of a second color, the third subpixel, SP3, emits light of a third color, and the fourth subpixel, SP4, emits light of a fourth color. The first through fourth subpixels, SP1 through SP4, can each emit light of a different color. For example, the first subpixel, SP1, can emit red light, the second subpixel, SP2, white light, the third subpixel, SP3, green light, and the fourth subpixel, SP4, blue light. However, the present disclosure is not limited to this, and the color of the light emitted by each of the subpixels, SP1, SP2, SP3, and SP4, as well as the arrangement order of the subpixels, SP1, SP2, SP3, and SP4, can be modified in various ways.

[0075] The non-transparent area NTA can comprise a first non-transparent area NTA1 and a second non-transparent area NTA2.

[0076] The first non-transparent area NTA1 can extend in a first direction, in the Y-axis direction, from the display area (see DA in Fig. 2) extend from. In the display board (see 100 in Fig. 2) Several first non-transparent areas NTA1 can be spaced apart from each other, and one of the several transparent areas TA can be located between two adjacent first non-transparent areas NTA1. First signal lines (see SL1 in) can be installed in the first non-transparent areas NTA1. Fig. 2), which extend in the first direction, in the Y-axis direction, are spaced apart from each other.

[0077] The first signal lines (see SL1 in Fig. 2) may, for example, include at least one common power line, one reference line, data lines and one pixel power line.

[0078] The pixel power line can supply initial power to the driver thin-film transistor of each of the subpixels SP1, SP2, SP3, SP4, which are arranged in the multiple pixel areas P. The common power line can supply secondary power to the cathode electrodes of the subpixels SP1, SP2, SP3, SP4, which are arranged in the multiple pixel areas P. This secondary power can be a common power supplied to all subpixels SP1, SP2, SP3, and SP4.

[0079] The reference line can supply an initialization voltage or a reference voltage to each of the drive transistors of the subpixels SP1, SP2, SP3, SP4, which are arranged in the multiple pixel areas P. Each of the data lines can supply a data voltage to the subpixels SP1, SP2, SP3, SP4.

[0080] The second non-transparent area NTA2 can extend in a second direction, in the X-axis direction, from the display area (see DA in Fig. 2) extend from. In the display board (see 100 in Fig. 2) Several second non-transparent areas NTA2 are spaced apart from each other, and one of the several transparent areas TA can be located between two adjacent second non-transparent areas NTA2. A second signal line SL2 can be located in the second non-transparent area NTA2.

[0081] The second signal line SL2 extends in a second direction, along the X-axis, and can, for example, include a scanning line SCANL. The scanning line SCANL can supply a scanning signal to the subpixels SP1, SP2, SP3, and SP4, which are arranged in the multiple pixel areas P.

[0082] Fig. Figure 4 is a cross-sectional view of a display device according to an embodiment of the present disclosure. In this case, it corresponds to Fig. 4 the cross-section II' of Fig. 3.

[0083] As it is in Fig. As can be seen from Figure 4, a display device according to an embodiment of the present disclosure comprises a first substrate 100a, a buffer layer 110, an active layer 120, a gate insulating layer 130, a gate electrode 140, an intermediate insulating layer 150, a source electrode 161, a drain electrode 162, a first insulating layer 170, a second insulating layer 180, a lower electrode 200a of the first electrode 200, a planarizing layer 190, an upper electrode 200b of the first electrode 200, a bank 210, a light-emitting layer 220, a second electrode 230, an encapsulation layer 240, a color filter 250, a black matrix 260 and a second substrate 100b.

[0084] The first substrate 100a can be made of glass or plastic. Specifically, the first substrate 100a can be made of a transparent plastic with flexible properties, such as polyimide. If polyimide is used as the first substrate 100a, and considering that a high-temperature deposition process will be performed on the first substrate 100a, a heat-resistant polyimide capable of withstanding high temperatures can be used.

[0085] The buffer layer 110 can be arranged on the first substrate 100a. The buffer layer 110 can block air and moisture to protect the active layer 120. The buffer layer 110 can be formed from an inorganic insulating material such as silicon dioxide, silicon nitride, or metal oxide, but is not limited to this and can be formed from an organic insulating material.

[0086] However, although not specifically shown, a light-blocking layer can be formed between the first substrate 100a and the buffer layer 110. In this case, the light-blocking layer can prevent light entering from the lower end of the first substrate 100a from reaching the active layer 120.

[0087] The active layer 120 can be arranged on the buffer layer 110. The active layer 120 can be made of a semiconductor material such as amorphous silicon (a-Si), polycrystalline silicon (Poly Si), or oxide semiconductor (Oxide).

[0088] The active layer 120 comprises a channel part 121, a first connecting part 122, which is arranged on one side of the channel part 121, for example on the left side, and a second connecting part 123, which is arranged on the other side of the channel part 121, for example on the right side.

[0089] The channel part 121 overlaps with the gate electrode 140. This arrangement protects the channel part 121 from being made conductive by the gate electrode 140 during the conductivity process of the active layer 120, thus preserving semiconductor properties.

[0090] The first interconnect 122 and the second interconnect 123 can be endowed with conductivity, for example, by a conductivity enhancement process in which plasma treatment is performed on a semiconductor material or doping with ions is carried out using the gate electrode 140 as a mask. The first interconnect 122 and the second interconnect 123 formed by the conductivity enhancement process exhibit excellent conductivity and can thus serve as electrodes or wiring. The gate insulating layer 130 can be arranged on the active layer 120. The gate insulating layer 130 can be arranged on the entire surface of the first substrate 100a, but is not limited to it. A section of the gate insulating layer 130 can be structured such that one end and the other end of the gate insulating layer 130 correspond to one end and the other end of the gate electrode 140, respectively.

[0091] The gate insulating layer 130 can comprise, among other things, a silicon nitride film (SiNx) or a silicon oxide film (SiOx). The gate insulating layer 130 can consist of a single layer or multiple layers containing an inorganic insulating material and / or an organic insulating material.

[0092] The gate electrode 140 can be arranged on the gate insulating layer 130.

[0093] The gate electrode 140 can contain a metal from the aluminum series such as aluminum (Al) or an aluminum alloy, a metal from the silver series such as silver (Ag) or a silver alloy, a metal from the copper series such as copper (Cu) or a copper alloy, a metal from the molybdenum series such as molybdenum (Mo) or a molybdenum alloy, chromium (Cr), tantalum (Ta), neodymium (Nd), and / or titanium (Ti). The gate electrode 140 can have a structure comprising a single metal layer or a multilayer film structure with at least two metal layers, each with different physical properties.

[0094] The interlayer insulating layer 150 can be arranged on the gate electrode 140. The interlayer insulating layer 150 insulates between the gate electrode 140 and the source electrode 161 and also insulates between the gate electrode 140 and the drain electrode 162. The interlayer insulating layer 150 can be formed from a single layer or multiple layers containing an inorganic insulating material and / or an organic insulating material.

[0095] A contact hole can be formed in the intermediate insulating layer 150. Accordingly, a section of the upper surface of the first connecting part 122 of the active layer 120 can be exposed through a contact hole, and furthermore, a section of the upper surface of the second connecting part 123 of the active layer 120 can be exposed through another contact hole.

[0096] The source electrode 161 and the drain electrode 162 can be arranged on the intermediate insulating layer 150.

[0097] The source electrode 161 can be electrically connected to the first connecting part 122 of the active layer 120 via a contact hole, and the drain electrode 162 can be electrically connected to the second connecting part 123 of the active layer 120 via a contact hole.

[0098] The source electrode 161 and the drain electrode 162 can be made of the same material as the gate electrode 140, but are not limited to this and can be made of a material according to the prior art.

[0099] The first insulating layer 170 is arranged on the source electrode 161, the drain electrode 162, and the intermediate insulating layer 150. The first insulating layer 170 can be formed from a single layer or multiple layers containing an inorganic insulating material and / or an organic insulating material.

[0100] The second insulating layer 180 is arranged on top of the first insulating layer 170.

[0101] The second insulating layer 180 can be formed from a single layer or multiple layers containing an inorganic insulating material and / or an organic insulating material.

[0102] According to one embodiment of the disclosure, the second insulating layer 180 can be configured with sections of different heights. The second insulating layer 180 can have a first part 181 with a first height h1, a second part 183 with a second height h2, and a third part 185 with a third height h3. In this case, the first height h1, the second height h2, and the third height h3 can have different heights, and, for example, the third height h3 can be greater than the first height h1 and the second height h2, and the first height h1 can be greater than the second height h2.

[0103] The second insulating layer 180 can be structured using a multi-tone mask. In this case, the first part 181, the second part 183, and the third part 185 can be formed using the multi-tone mask in the same process. The multi-tone mask can be defined as a mask containing areas with different transmittances. Therefore, when the second insulating layer 180 is structured using the multi-tone mask, it can be structured at different heights while traversing areas with varying transmittances. The second insulating layer 180 can have its highest height h3 in the area outside the light-emitting region. That is, within the light-emitting region, the second insulating layer 180 can have heights h1 and h2 that are lower than height h3.The first and second heights h1, h2 of the second insulating layer 180 can have a stepped or up-and-down pattern, with height h2 being the smallest and the first height being between the second and third heights. In a preferred embodiment, the ratio is therefore essentially: h2 is 1 / 3 of h3 and h1 is 2 / 3 of h3.

[0104] The first part 181 and the second part 183 can overlap with the light-emitting area defined by the bank 210. Therefore, the first part 181 and the second part 183 can overlap with the upper electrode 200b of the first electrode 200, which is exposed and not covered by the bank 210.

[0105] According to one embodiment of the disclosure, by adjusting the first height h1 and the second height h2 of the first part 181 and the second part 183, the distance between the lower electrode 200a and the second electrode 230 can be adjusted to be an integer multiple of half a wavelength of red R, green G and blue B light.

[0106] The first part 181 and the second part 183 can be designed to have different heights depending on the color of the light that the first subpixel SP1 is intended to display.

[0107] The third part 185 may not overlap with the light-emitting area. A first contact hole CH1 may be formed in the third part 185. The upper surface of the source electrode 161 may be exposed through the first contact hole CH1.

[0108] The first electrode 200 can be arranged on the second insulating layer 180. The first electrode 200 can function as the anode. Accordingly, when a signal is applied to the first electrode 200, holes moving from the first electrode 200 can flow into the light-emitting layer 220.

[0109] The first electrode 200 comprises a lower electrode 200a and an upper electrode 200b. In this case, the lower electrode 200a and the upper electrode 200b are configured to be spaced apart from each other. Specifically, for example, a planarization layer 190 is arranged between the lower electrode 200a and the upper electrode 200b, so that the lower electrode 200a and the upper electrode 200b can be spaced apart from each other.

[0110] However, by adjusting the distance between the lower electrode 200a and the upper electrode 200b, the reflectance of external light incident from outside the display device can be reduced. Specifically, the distance between the lower electrode 200a and the upper electrode 200b can be adjusted so that the light incident from outside the second substrate 100b and reflected by the lower electrode 200a, and the light incident from outside the second substrate 100b and reflected by the upper electrode 200b, interfere destructively with each other.For example, by adjusting the distance between the protruding part 200a1 of the lower electrode 200a and the upper electrode 200b, or the distance between the concave part 200a2 of the lower electrode 200a and the upper electrode 200b, the external light reflected by the protruding part 200a1 or the concave part 200a2 and the external light reflected by the upper electrode 200b can be caused to interfere destructively with each other, thereby reducing the degree of external light reflection. In this case, the user can ensure improved visibility due to the reduction in external light reflection. For example, the distance between the protruding part 200a1 or the concave part 200a and the upper electrode 200b can be the distance between the protruding part 200a1 or the concave part 200a and the upper electrode 200b in the vertical direction of the display device 10 (Z-axis).

[0111] The lower electrode 200a is arranged on the second insulating layer 180. The lower electrode 200a can be a reflective electrode. The lower electrode 200a can be made of a material with a high reflectivity. For example, the lower electrode 200a can be formed from several layers in which aluminum palladium copper (APC), aluminum (Al), and indium tin oxide (ITO) are alternately laminated, a double-layer structure of Ag / ITO, a double-layer structure of APC / ITO, a triple-layer structure of ITO / Ag / ITO, or a triple-layer structure of ITO / APC / ITO, but is not limited to these and can be formed from a single metal layer with a high reflectivity or from several metal layers.

[0112] In one embodiment, the lower electrode 200a can be configured in a curved or stepped structure. Specifically, the lower electrode 200a can be arranged on the second insulating layer 180 and be configured in the same shape as the first part 181, the second part 183, and the third part 185 of the second insulating layer 180. Accordingly, one section of the lower electrode 200a can be arranged on the first section 181 and configured in a projecting structure, and the other section of the lower electrode 200a can be arranged on the second section 183 and configured in a concave structure. This configuration allows light that has traveled from the light-emitting layer 220 to the lower electrode 200a to be emitted outwards from the first subpixel SP1 without being trapped within it, thereby increasing the light emission efficiency.

[0113] The lower electrode 200a can comprise a projecting part 200a1, a concave part 200a2, an inclined part 200a3, and a contact part 200a4. The projecting part 200a1, the concave part 200a2, the inclined part 200a3, and the contact part 200a4 can be arranged continuously. The projecting part 200a1, a concave part 200a2, and an inclined part 200a3 can be arranged repeatedly or multiple times in the emission region and surrounded by the contact part 200a4.

[0114] The protruding part 200a1 is arranged on the first part 181 of the second insulating layer 180, and the concave part 200a2 is arranged on the second part 183 of the second insulating layer 180. Therefore, the protruding part 200a1 can be arranged in a higher position than the concave part 200a2.

[0115] The inclined part 200a3 can be arranged between the protruding part 200a1 and the concave part 200a2. The inclined part 200a3 can be provided such that it is inclined at a predetermined angle to the upper surfaces of the protruding part 200a1 and the concave part 200a2. According to one embodiment, the amount of light emitted outwards from the first subpixel SP1 can increase because the light emitted by the light-emitting layer 220 is reflected by the inclined part 200a3.

[0116] The contact part 200a4 is arranged on the third part 185 of the second insulating layer 180. The contact section 200a4 can be electrically connected to the source electrode 161 via the first contact hole CH1, which is formed in the third section 185 of the second insulating layer 180, and to the upper electrode 200b via the second contact hole CH2.

[0117] The planarization layer 190 can be arranged on the second insulating layer 180 and the lower electrode 200a of the first electrode 200. The planarization layer 190 can be arranged on the second insulating layer 180 and the lower electrode 200a of the first electrode 200, so that the upper surface of the planarization layer 190 can be planarized.

[0118] The foreground planarization layer 190 is arranged with the second contact hole CH2 and a section of the upper surface of the lower electrode 200a may be exposed through the second contact hole CH2.

[0119] The planarization layer 190 can consist of an organic insulating layer material. The planarization layer 190 can be made of an organic insulating material such as an acrylic resin, an epoxy resin, a phenolic resin, a polyamide resin, or a polyimide resin. The planarization layer 190 can be transparent.

[0120] The upper electrode 200b of the first electrode 200 can be arranged on the planarization layer 190. The upper electrode 200b can be electrically connected to the lower electrode 200a via the second contact hole CH2.

[0121] The upper electrode 200b can be designed as a transparent electrode. The upper electrode 200b can, for example, consist of indium tin oxide (ITO) or indium zinc oxide (IZO).

[0122] The upper electrode 200b is arranged on the planarization layer 190 and can therefore have a different shape than the lower electrode 200a. Specifically, the upper electrode 200b, unlike the lower electrode 200a, which has a curved shape, can be flat or planar. Accordingly, the upper surface of the upper electrode 200b can be flat, without having a separate protruding and / or concave portion.

[0123] According to one embodiment, light can be uniformly formed in every region of the light-emitting layer 220 in contact with the upper electrode 200b because the upper surface of the upper electrode 200b is flat. If the upper surface of the upper electrode 200b is not flat, the light-emitting layer 220 may not form uniformly due to the curved or protruding surface of the upper electrode during the formation process. In this case, the light emitted from the non-uniformly formed light-emitting layer 220 may exhibit some deviation and thus not form uniform light.

[0124] The bank 210 can be arranged on the first electrode 200, in particular on the upper electrode 200b. In this case, a section of the upper surface of the first electrode 200 that is exposed and not covered by the bank 210 becomes a light-emitting area.

[0125] Bank 210 can be formed from an organic film such as an acrylic resin, an epoxy resin, a phenolic resin, a polyamide resin or a polyimide resin.

[0126] The light-emitting layer 220 can be arranged on the first electrode 200. The light-emitting layer 220 can comprise a red, green, and blue light-emitting layer structured for each subpixel, or it can be formed from a white light-emitting layer connected to all pixels. If the light-emitting layer 220 is formed from a white light-emitting layer, it can, for example, comprise a first stack of a blue light-emitting layer, a second stack of a yellow-green light-emitting layer, and a charge-generating layer arranged between the first and second stacks, but this is not necessarily limited to the first stack.

[0127] According to one embodiment, the light-emitting layer 220 arranged in the first subpixel SP1 can, for example, emit white light.

[0128] The second electrode 230 can be arranged on the light-emitting layer 220. The second electrode 230 can function as a cathode.

[0129] The encapsulation layer 240 can be arranged on the second electrode 230. The encapsulation layer 240 can be arranged on the entire surface of the first substrate 100a.

[0130] The encapsulation layer 240 can be made of acrylic resin, epoxy resin, polyimide, polyethylene (PE) or silicon oxycarbon (SiOC).

[0131] However, although not specifically shown, the encapsulation layer 240 can comprise a first encapsulation layer containing an inorganic substance, a second encapsulation layer containing an organic substance, and a third encapsulation layer containing an inorganic substance.

[0132] The color filter 250 can be arranged on the encapsulation layer 240. Specifically, the color filter 250 can be configured to correspond to the first subpixel SP1.

[0133] The color filter 250 can transmit light of any color from red, green, and blue. Accordingly, the light emitted by the light-emitting layer 220 located in the first subpixel SP1 passes through the color filter 250 and is emitted outwards. In this case, if the light emitted from the light-emitting layer 220 is white and the color filter 250 is a red color filter that transmits red light, then red light can be emitted from the first subpixel SP1. However, the disclosure is not limited to this, and depending on the combination of the light-emitting layer 220 located in the first subpixel SP1 and the color filter 250, light of various colors can be emitted from the first subpixel SP1.As another example, if the color filter 250 is a green color filter that transmits green light, green light can be emitted from the first subpixel SP1, and as another example, if the color filter 250 is a blue color filter that transmits blue light, blue light can be emitted from the first subpixel SP1.

[0134] The black matrix 260 can be arranged on the encapsulation layer 240 and the color filter 250.

[0135] The black matrix 260 overlaps bank 210 and is located between the first subpixel SP1 and the neighboring subpixels (see the second subpixel SP2 to fourth subpixel SP4 in Fig. 3) formed, thereby preventing the problem that the first subpixel SP1 and the other subpixels (see the second subpixel SP2 to fourth subpixel SP4 in Fig. 3) emitted light is mixed together, causing a color mixture.

[0136] The second substrate 100b can be arranged on the black matrix 260. The second substrate 100b can be connected to the first substrate 100a and simultaneously facing it.

[0137] The second substrate 100b can be made of glass or plastic. In particular, the second substrate 100b can be made of a transparent plastic that has flexible properties, for example, polyimide.

[0138] Fig. Figure 5 is a cross-sectional view of a display device of one embodiment. Fig. Figure 5 is an enlarged view of area B of Fig. 4, Fig. 5 refers to the same embodiment as Fig. 4, where the same components are assigned the same numbers and repeated descriptions are omitted.

[0139] In one embodiment, the second insulating layer 180 comprises a first part 181 and a second part 183, which have different heights. Accordingly, the lower electrode 200a of the first electrode 200, which is arranged on the second insulating layer 180, can be arranged with the same curved shape along the curved shape of the second insulating layer 180.

[0140] In this case, the protruding part 200a1 of the lower electrode 200a, which is arranged on the first part 181, and the concave part 200a2 of the lower electrode 200a, which is arranged on the second part 183, can be formed at different positions or heights.

[0141] Accordingly, the distances in each region between the second electrode 230 and the lower electrode 200a can differ due to the curved shape of the lower electrode 200a. Specifically, the shortest distance between the protruding part 200a1 of the lower electrode 200a and the second electrode 230 can differ from the shortest distance between the concave part 200a2 of the lower electrode 200a and the second electrode 230.

[0142] In one embodiment of the disclosure, the shortest distance between the protruding part 200a1 and the second electrode 230 and the shortest distance between the concave part 200a2 and the second electrode 230 can be provided differently depending on the color of the light to be displayed in the first subpixel SP1. For example, if the first subpixel SP1 displays red R-light, the shortest distance between the protruding part 200a1 and the second electrode 230 and the shortest distance between the concave part 200a2 and the second electrode 230 can be configured as distances that are each integer multiples of half a wavelength of the light displaying red R. This configuration forms a microcavity (or microresonance) for the red R-light, thus increasing the light emission efficiency of the red R-light emitted by the first subpixel SP1.

[0143] However, without further limitation, as a further example, if the first subpixel SP1 displays green G-light, the shortest distance between the protruding part 200a1 and the second electrode 230, and the shortest distance between the concave part 200a2 and the second electrode 230, can be configured as distances that are each integer multiples of half a wavelength of the light displaying green G. This configuration creates a microcavity (or microresonance) for the green G-light, thus increasing the light emission efficiency of the green G-light emitted by the first subpixel SP1.

[0144] As a further example, if the first subpixel SP1 displays blue B light, the shortest distance between the protruding part 200a1 and the second electrode 230, and the shortest distance between the concave part 200a2 and the second electrode 230, can be configured as distances that are each integer multiples of half a wavelength of light displaying blue B. This configuration creates a microcavity (or microresonance) for the blue B light, thus increasing the light emission efficiency of the blue B light emitted by the first subpixel SP1.

[0145] The light b emitted by the light-emitting layer 220 is emitted towards the second substrate 100b. In this case, the light b can implement the color that the first subpixel SP1 wants to display by passing through the color filter 250.

[0146] Other light c, emitted from the light-emitting layer 220, can pass through the upper electrode 200b and be reflected by the projecting part 200a1 of the lower electrode 200a. According to one embodiment of the present disclosure, since the projecting part 200a1 is arranged at a position where the distance between the projecting part 200a1 and the second electrode 230 is an integer multiple of half a wavelength of red (R), green (G), and blue (B) light, the light b emitted by the light-emitting layer 220 and the light c reflected by the projecting part 200a1 can constructively interfere with each other to form a microcavity. For example, the distance between the protruding part 200a1 and the second electrode 230 can be the distance between the protruding part 200a1 and the second electrode 230 in the vertical direction of the display device 10 (Z-axis).

[0147] Similarly, further light d emitted from the light-emitting layer 220 can pass through the upper electrode 200b and be reflected by the concave part 200a2 of the lower electrode 200a. According to one embodiment of the present disclosure, the light b emitted from the light-emitting layer 220 and the light d reflected by the concave part 200a2 can form a microcavity by constructive interference, since the concave part 200a2 is located at a position where the distance between the concave part 200a2 and the second electrode 230 is an integer multiple of half a wavelength of red R, green G, and blue B light. For example, the distance between the concave part 200a2 and the second electrode 230 can be the distance between the concave part 200a2 and the second electrode 230 in the vertical direction of the display device 10 (Z-axis).

[0148] Therefore, according to one embodiment, light a, emitted from the light-emitting layer 220 and forming a predetermined angle with the upper surface of the light-emitting layer 220, can pass through the upper electrode 200b and be reflected by the inclined portion 200a3 of the lower electrode 200a. Since, in this case, the inclined portion 200a3 is designed to be inclined at a predetermined angle to the upper surface of the light-emitting layer 220, the light a can be reflected from the inclined portion 200a3 in such a way that it propagates through the light-emitting layer 220 and towards the color filter 250. Accordingly, the proportion of light a reflected from the inclined portion 200a3 and emitted outside the first subpixel SP1 is increased, thereby increasing the light emission efficiency of the first subpixel SP1. Fig. Figure 6 is a top view schematically showing an upper electrode and a lower electrode according to one embodiment of the disclosure. However, the embodiment of Fig. 6 the same as the embodiment of Fig. 4. The same reference symbols are assigned to the same components, and repeated descriptions are omitted.

[0149] As it is in Fig. As can be seen in Figure 6, the first electrode 200 consists of a lower electrode 200a and an upper electrode 200b.

[0150] The lower electrode 200a consists of a protruding part 200a1, a concave part 200a2, an inclined part 200a3 and a contact part 200a4.

[0151] According to one embodiment, the concave parts 200a2 can be formed in multiple numbers between the preceding parts 200a1. For example, the concave parts 200a2 can be arranged in three horizontal directions and three vertical directions. However, the present disclosure is not limited to this and the number of concave parts can vary depending on the knowledge of those skilled in the art.

[0152] The inclined part 200a3 can be provided in such a way that it surrounds the perimeter of the concave part 200a2.

[0153] According to one embodiment, by positioning the protruding part 200a1 and the concave part 200a2 at a distance that forms a microcavity for light of a color emitted from the light-emitting layer (see 220 in Fig. 4), the light emission efficiency of the first subpixel (see SP1 in Fig. 4) be improved. Fig. Figure 7 is a cross-sectional view of a display device according to a further embodiment of the present disclosure. In this case, it corresponds to Fig. 7 the cross-section II' of Fig. 3. However, the embodiment of Fig. 7, except for the configuration of the open part, identical to the embodiment of Fig. 5, so that the following description focuses on the differing configuration.

[0154] As it is in Fig. As shown in Figure 7, a display device according to a further embodiment of the present disclosure comprises a first substrate 100a, a buffer layer 110, an active layer 120, a gate insulating layer 130, a gate electrode 140, an intermediate insulating layer 150, a source electrode 161, a drain electrode 162, a first insulating layer 170, a second insulating layer 180, a lower electrode 200a of the first electrode 200, a planarizing layer 190, an upper electrode 200b of the first electrode 200, a bank 210, a light-emitting layer 220, a second electrode 230, an encapsulation layer 240, a color filter 250, a black matrix 260 and a second substrate 100b.

[0155] According to a further embodiment of the present disclosure, the lower electrode 200a may have an open part OP which exposes a section of the upper surface of the second insulating layer 180.

[0156] The open part OP can, for example, be formed in one of the protruding part 200a1 and the concave part 200a2 of the lower electrode 200a. Since the open part OP is formed in one of the protruding part 200a1 and the concave part 200a2, the inclined part 200a3 may not expose the upper surface of the second insulating layer 180. Accordingly, light emitted from the light-emitting layer 220 at a predetermined angle with the upper surface of the light-emitting layer 220 can be reflected by the inclined part 200a3, thereby improving the light emission efficiency of the first subpixel SP1.

[0157] Meanwhile, in Fig. 7 The open part OP is formed in the area where the projecting part 200a1 is formed to expose a section of the upper surface of the first part 181 of the second insulating layer 180, but it is not limited to this area. The open part OP may be formed in the area where the concave part 200a2 is formed to expose a section of the upper surface of the second part 183 of the second insulating layer 180, and the open part OP may be formed in the area where the projecting part 200a1 and the concave part 200a2 are formed to expose a section of the upper surfaces of the first part 181 and the second part 183 of the second insulating layer 180.

[0158] According to a further embodiment of the present disclosure, by forming the open part OP in a section of the lower electrode 200a, the degree to which external light emitted from outside the display device of the present disclosure through the second substrate 100b is reflected and perceived by the user can be reduced or eliminated. This type of formation can improve the visual experience of the user viewing the display device.

[0159] Fig. Figure 8 is a top view schematically showing an upper electrode and a lower electrode according to a further embodiment of the present disclosure. However, the embodiment of Fig. 8, except for the configuration of the open part, identical to the embodiment of Fig. 6, so that the following description focuses on the differing configuration.

[0160] As it is in Fig. As can be seen in Figure 8, the first electrode 200 consists of a lower electrode 200a and an upper electrode 200b.

[0161] The lower electrode 200a consists of a protruding part 200a1, a concave part 200a2, an inclined part 200a3 and a contact part 200a4.

[0162] According to a further embodiment of the present disclosure, the lower electrode 200a can be configured to include the open part OP. In this case, since part of the lower electrode 200a is removed by the open part OP, as described in Fig. As described in section 7, the degree to which light introduced from outside the display device is reflected by the lower electrode 200a and perceived by the user's eyes is reduced or eliminated.

[0163] As it is in Fig. As can be seen in Figure 8, the open part OP is formed in a region where the preceding part 200a1 is formed, and the open part OP can be formed between two adjacent concave parts 200a2. However, the present disclosure is not limited to this, and the open part OP can be arranged between four adjacent concave parts 200a2. Furthermore, as shown in Figure 8, the open part OP can be formed between four adjacent concave parts 200a2. Fig. As described in section 7, the open part OP may be formed in the concave part 200a2 instead of the foreground part 200a1, and the open part OP may be formed in both the foreground part 200a1 and the concave part 200a2.

[0164] The number and area of ​​the open parts OP can be changed and adapted differently depending on the degree to which external light incident from outside the display device of the present disclosure is reflected on the lower electrode 200a, depending on the knowledge of a person skilled in the art.

[0165] However, according to one embodiment of the present disclosure, it is advantageous if the open part OP is formed in one of the regions in which the projecting part 200a1 is formed and the regions in which the concave part 200a2 is formed. If it is formed such that it overlaps both the region in which the projecting part 200a1 is formed and the region in which the concave part 200a2 is formed, the open part OP can overlap the region in which the inclined part 200a3 is formed. In this case, it is possible to partially suppress the display of the light reflected from the inclined part 200a3 as the first subpixel (see SP1 in Fig. 7).

[0166] Fig. Figure 9 is a cross-sectional view of a display device according to a further embodiment of the present disclosure. In this case, it corresponds to Fig. 9 the cross-section II-II' of Fig. 3. However, the embodiment of Fig. 9 identical to the embodiment of Fig. 4 except for the second subpixel SP2, and therefore the following description focuses on the differing configurations.

[0167] As it is in Fig. As shown in Figure 9, a display device according to a further embodiment of the present disclosure comprises a first subpixel SP1 and a second subpixel SP2. The first subpixel SP1 can, for example, display one of the colors red R, green G, and blue B, and the second subpixel SP2 can, for example, display white W. Since the first subpixel SP1 is Fig. 9 with the first subpixel SP1 according to the embodiment of Fig. Since 4 is identical, the following description focuses on the second subpixel SP2.

[0168] According to a further embodiment of the present disclosure, the second subpixel SP2 comprises a first substrate 100a, a buffer layer 110, an active layer 120, a gate insulating layer 130, a gate electrode 140, an intermediate insulating layer 150, a source electrode 161, a drain electrode 162, a first insulating layer 170, a second insulating layer 180, a lower electrode 200a of the first electrode 200, a planarization layer 190, an upper electrode 200b of the first electrode 200, a bank 210, a light-emitting layer 220, a second electrode 230, an encapsulation layer 240, a black matrix 260 and a second substrate 100b.

[0169] The second insulating layer 180 is arranged on top of the first insulating layer 170.

[0170] The second insulating layer 180 can be formed from a single layer or multiple layers containing an inorganic insulating material and / or an organic insulating material.

[0171] According to a further embodiment of the present disclosure, the second insulating layer 180 can be formed by including sections with different heights. The second insulating layer 180 can be formed with a first part 181' with a first height h1', a second part 183' with a second height h2', a third part 185' with a third height h3', and a fourth part 187' with a fourth height h4. In this case, the first height h1', the second height h2', the third height h3', and the fourth height h4' can be different heights from one another, and, for example, the fourth height h4' can be greater than the first height h1', the second height h2', and the third height h3'; the first height h1' can be greater than the second height h2', and the third height h3' can be greater than the second height h2'. The second insulating layer 180 can be structured by a multi-tone mask.In this case, the first part 181', the second part 183', the third part 185' and the fourth part 187' can be formed in the same process using the multitone mask.

[0172] The first part 181', the second part 183', and the third part 185' can overlap with the light-emitting area defined by the bank 210. Therefore, the first part 181', the second part 183', and the third part 185' can overlap with the upper electrode 200b of the first electrode 200, which is exposed and not covered by the bank 210.

[0173] According to one embodiment of the present disclosure, by adjusting the first height h1', the second height h2' and the third height h3' of the first part 181', the second part 183' and the third part 185', the distance between the lower electrode 200a and the second electrode 230 can be adjusted such that it is an integer multiple of half a wavelength of red R, green G and blue B light.

[0174] The first part 181', the second part 183', and the third part 185' can be designed to have different heights depending on the red (R), green (G), and blue (B) light emitted. For example, the first height h1' of the first part 181' can be adjusted so that the distance between the lower electrode 200a and the second electrode 230 is an integer multiple of half a wavelength of red (R) light; the second height h2' of the second part 183' can be adjusted so that the distance between the lower electrode 200a and the second electrode 230 is an integer multiple of half a wavelength of green (G) light; and the third height h3' of the third part 185' can be adjusted so that the distance between the lower electrode 200a and the second electrode 230 is an integer multiple of half a wavelength of blue (B) light.

[0175] The fourth part 187' may not overlap with the light-emitting area. A first contact hole CH1 may be formed in the fourth part 187'. The upper surface of the source electrode 161 may be exposed through the first contact hole CH1.

[0176] According to a further embodiment of the present disclosure, the fourth height h4' of the fourth part 187' of the second subpixel SP2 can be configured to have the same height as the third height h3 of the third part 185 of the first subpixel SP1. This configuration allows the second contact hole CH2 for connecting the lower electrode 200a and the upper electrode 200b to be formed in the same process. Since no additional separate process for forming contact holes of different lengths is required, the manufacturing process and production time can be reduced.

[0177] The first electrode 200 can be arranged on the second insulating layer 180. The first electrode 200 can function as the anode. Therefore, when a signal is applied to the first electrode 200, holes migrating from the first electrode 200 can flow into the light-emitting layer 220. The first electrode 200 comprises a lower electrode 200a and an upper electrode 200b.

[0178] The lower electrode 200a is arranged on the second insulating layer 180. The lower electrode 200a can be a reflective electrode. The lower electrode 200a can be made of a material with a high reflectivity. For example, the lower electrode 200a can be formed from several layers in which aluminum palladium copper (APC), aluminum (Al), and indium tin oxide (ITO) are alternately laminated, a double-layer structure of Ag / ITO, a double-layer structure of APC / ITO, a triple-layer structure of ITO / Ag / ITO, or a triple-layer structure of ITO / APC / ITO, but is not limited to these and can be formed from a single metal layer with a high reflectivity or from several metal layers.

[0179] According to one embodiment of the present disclosure, the lower electrode 200a can be configured in a curved structure. Specifically, the lower electrode 200a can be arranged on the second insulating layer 180 and configured in the same shape as the first part 181', the second part 183', the third part 185', and the fourth part 187' of the second insulating layer 180. Accordingly, one section and the other section of the lower electrode 200a can be arranged on the first section 181' and the third section 185' and configured in a projecting structure, and another section of the lower electrode 200a can be arranged on the second section 183' and configured in a concave structure.This shape ensures that the light emitted from the light-emitting layer 220 towards the lower electrode 200a is emitted outwards to the second subpixel SP2 without being trapped inside it, thereby increasing the light emission efficiency.

[0180] The lower electrode 200a can comprise a first projecting part 200a1', a concave part 200a2', a second projecting part 200a4', an inclined part 200a3' and a contact part 200a5'. The first projecting part 200a1', the concave part 200a2', the second projecting part 200a4', the inclined part 200a3' and the contact part 200a5' can be arranged consecutively.

[0181] The first projecting part 200a1' is arranged on the first part 181' of the second insulating layer 180, the concave part 200a2' is arranged on the second part 183' of the second insulating layer 180, and the second projecting part 200a4' is arranged on the third part 185' of the second insulating layer 180. In this case, the first projecting part 200a1' can be arranged at a higher position than the concave part 200a2' and the second projecting part 200a4', and the second projecting part 200a4' can be arranged at a higher position than the concave part 200a2'.

[0182] According to a further embodiment of the present disclosure, by adjusting the heights of the first part 181', the second part 183' and the third part 185' of the second insulating layer 180, the heights of the first projecting part 200a1', the concave part 200a2' and the second projecting part 200a4' of the lower electrode 200a can be adjusted. In this case, by adjusting the first height h1' of the first part 181' of the second insulating layer 180, the shortest distance between the first projecting part 200a1' and the second electrode 230 can be formed as a distance that is an integer multiple of half a wavelength of light representing one of the colors red R, green G and blue B, and by adjusting the second height h2' of the second part 183' of the second insulating layer 180, the shortest distance between the concave part 200a2' and the second electrode 230 can be formed as a distancewhich is an integer multiple of half a wavelength of light representing the other of the colors red R, green G, and blue B, and by adjusting the third height h3' of the third part 185' of the second insulating layer 180, the second projecting part 200a4', and the shortest distance between the second electrodes 230 to be a distance that is an integer multiple of half a wavelength of light representing another of the colors red R, green G, and blue B. Accordingly, the second subpixel SP2, which displays white W, can be provided with a microcavity (or microresonance) designed for all the light displaying red R, green G, and blue B.

[0183] In a case where, for example, the first subpixel SP1 displays Red R, the third subpixel (see SP3 in Fig. 3) Green G indicates the fourth subpixel (see SP4 in Fig. 3) If blue B is displayed and the second subpixel SP2 displays white W, for example, one of the first projecting part 200a1', the concave part 200a2' and the second projecting part 200a4' of the lower electrode 200a located in the second subpixel SP2, the first projecting part 200a1' can be formed with the same height as one of the projecting part 200a1 and the concave part 200a2 of the lower electrode 200a of the first subpixel SP1. In this case, the distance between the first projecting part 200a1' of the second subpixel SP2 and the second electrode 230 can be provided as an integer multiple of half a wavelength of red R light. For example, the distance between the first projecting part 200a1' and the second electrode 230 can be the distance between the first projecting part 200a1' and the second electrode 230 in the vertical direction of the display device 10 (Z-axis).However, the present disclosure is not limited thereto, and the height of any first projecting part 200a1', the concave part 200a2', and the second projecting part 200a4' of the second subpixel SP2 may differ from the heights of the projecting part 200a1 and the concave part 200a2 of the first subpixel SP1. Although not specifically shown, the third subpixel (see SP3 in . Fig. 3) and the fourth subpixel (see SP4 in Fig. 3) similarly to the first subpixel SP1, comprising a lower electrode 200a, which includes a protruding part and a concave part. In this case, the second subpixel SP2 may include another of the first protruding part 200a1', the concave part 200a2', and the second protruding part 200a4', for example, the second protruding part 200a4', with the same height as one of the protruding part and the concave part of the third subpixel (see SP3 in Fig. 3) be formed, and in the second subpixel SP2 another of the first projecting part 200a1', the concave part 200a2' and the second projecting part 200a4', for example the concave part 200a2', with the same height as one of the projecting part and the concave part of the fourth subpixel (see SP4 in Fig. 4) be configured. In this case, the distance between the second projecting part 200a4' of the second subpixel SP2 and the second electrode 230 can be provided as an integer multiple of half a wavelength of green G-light, and the distance between the concave part 200a2' of the second subpixel SP2 and the second electrode 230 can be provided as an integer multiple of half a wavelength of blue B-light. For example, the distance between the second projecting part 200a4' or the concave part 200a2' and the second electrode 230 can be the distance between the second projecting part 200a4' or the concave part 200a2' and the second electrode 230 in the vertical direction of the display device 10 (Z-axis). However, the present disclosure is not limited thereto.

[0184] According to one embodiment of the present disclosure, in the second subpixel SP2, which displays the white color W, a microcavity or microresonance for all the light representing the red color R, the green color G and the blue color B is formed by the first projecting part 200a1', the concave part 200a2' and the second projecting part 200a4', so that a high light emission efficiency can be achieved without affecting the color purity of the white color W displayed by the second subpixel SP2.

[0185] The inclined portion 200a3' can be arranged between the first projecting portion 200a1' and the concave portion 200a2', between the concave portion 200a2' and the second projecting portion 200a4', and between the first projecting portion 200a1' and the second projecting portion 200a4'. The inclined portion 200a3' can be provided such that it is inclined at a predetermined angle to the upper surfaces of the first projecting portion 200a1', the second projecting portion 200a4', and the concave portion 200a2'. According to one embodiment of the present disclosure, the amount of light emitted outwards from the second subpixel SP2 can increase because the light emitted by the light-emitting layer 220 is reflected by the inclined portion 200a3'.

[0186] The contact part 200a5' is arranged on the fourth part 187' of the second insulating layer 180. The contact part 200a5' can be electrically connected to the source electrode 161 via the first contact hole CH1, which is formed in the fourth part 187' of the second insulating layer 180, and electrically connected to the upper electrode 200b via the second contact hole CH2.

[0187] The upper electrode 200b of the first electrode 200 can be arranged on the planarization layer 190. The upper electrode 200b can be electrically connected to the lower electrode 200a via the second contact hole CH2.

[0188] The upper electrode 200b can be designed as a transparent electrode. The upper electrode 200b can, for example, be made of indium tin oxide (ITO) or indium zinc oxide (IZO).

[0189] The upper electrode 200b is arranged on the planarization layer 190 and can therefore have a different shape than the lower electrode 200a. Specifically, the upper electrode 200b, unlike the lower electrode 200a, which has a curved shape, can be flat. Accordingly, the upper surface of the upper electrode 200b can be flat, without having a separate protruding and / or concave portion.

[0190] According to one embodiment of the present disclosure, light can be formed uniformly in every region of the light-emitting layer 220 that is in contact with the upper electrode 200b, since the upper surface of the upper electrode 200b is flat. If the upper surface of the upper electrode 200b is not flat, the light-emitting layer 220 may not form uniformly due to the curved or protruding surface of the upper electrode during the process of forming the light-emitting layer 220. In this case, the light emitted by the non-uniformly formed light-emitting layer 220 may exhibit some deviation and thus not form uniform light.

[0191] Fig. Figure 10A is a top view of a display device according to a further embodiment of the present disclosure. In this case, Fig. 10A an enlarged view of area A from Fig. 2. Fig. 10B is an enlarged top view of a display device according to a further embodiment of the present disclosure. In this case, Fig. 10B an enlarged view of area C of Fig. 10A. However, the embodiment of Fig. 10A except that two light-emitting areas are formed in one subpixel, with the embodiment of Fig. 3 are identical, and the following description focuses on differing configurations.

[0192] As it is in Fig. As can be seen in Figure 10A, a display device according to a further embodiment of the present disclosure comprises several pixel areas P, a non-transparent area NTA and several transparent areas TA.

[0193] According to one embodiment of the present disclosure, the first subpixel SP1, the second subpixel SP2, the third subpixel SP3 and the fourth subpixel SP4 each comprise two light-emitting areas. Accordingly, the first subpixel SP1 comprises a 1-1 light emission area EA1a and a 2-2 light emission area EA2b, which display a first color from red R, green G, blue B and white W; the second subpixel SP2 comprises a 2-1 light emission area EA2a and a 3-2 light emission area EA3b, which display a third color from red R, green G, blue B and white W; the third subpixel SP3 comprises a 3-1 light emission area EA3a and a 3-2 light emission area EA3b, which display a third color from red R, green G, blue B and white W; and the fourth subpixel SP4 comprises a 4-1 light emission area EA4a and a 4-2 light emission area EA4b, which display a fourth color from red R, green G, blue B and white W.

[0194] As it is in Fig. As can be seen in Figure 10B, each of the light-emitting areas according to the embodiment of the present disclosure can be provided with a repair structure to provide for cases of pixel drive failure. For example, a repair structure can be formed by creating a projection on each of the upper electrode 200b and the lower electrode 200a, which are arranged in the light-emitting areas EA1a to EA4b. By repairing the light-emitting area with a drive failure between two light-emitting areas that emit a color, it is thus possible to implement a display device without a defect in color realization, since the light-emitting area that is driven normally is preserved. A further embodiment of the present disclosure for implementing a repair structure is described below.

[0195] As it is in Fig. As can be seen in Figure 10B, the 1-1 light emission region EA1a and the 1-2 light emission region EA1b are formed by including a lower electrode 200a, which is formed jointly in the 1-1 light emission region EA1a and the 1-2 light emission region EA1b, and an upper electrode 200b, which is structured to correspond to the 1-1 light emission region EA1a and the 1-2 light emission region EA1b.

[0196] According to one embodiment of the present disclosure, the 1-1 light emission region EA1a comprises a first projecting pattern PPa for a repair structure. The first projecting pattern PPa can be configured to extend from the 1-1 light emission region EA1a and project to one side, for example, to an adjacent transmission section TA, for example, to the left.

[0197] The first of the above pattern PPa can be formed by electrically connecting a section projecting from a lower electrode 200a located in the above 1-1 light emission region EA1a and a section projecting from an upper electrode 200b located in the above 1-1 light emission region EA1a via a 2-1 contact hole CH2a.

[0198] The first foregoing pattern PPa includes a first repair point RPa formed between the 1-1 light emission area EA1a and the 2-1 contact hole CH2a.

[0199] The 1-2 light emission area EA1b includes a second projecting pattern PPb for a repair structure. The second projecting pattern PPb can be configured to extend from the 1-2 light emission area EA1b and project to one side, for example to an adjacent transmission section TA, for instance to the left.

[0200] The second above pattern PPb can be formed by electrically connecting a section projecting from a lower electrode 200a located in the above 1-2 light emission region EA1b and a section projecting from an upper electrode 200b located in the above 1-2 light emission region EA1b via a 2-2 contact hole CH2b.

[0201] The second above pattern PPb includes a second repair point RPb formed between the 1-2 light emission area EA1b and the 2-2 contact hole CH2b.

[0202] For example, if a control failure occurs in one of the light emission areas 1-1 EA1a and 1-2 EA1b, the display device can only be controlled using normal pixels by repairing one of the first repair point RPa and one of the second repair point RPb. This prevents the appearance of dark spots.

[0203] For example, if a control failure occurs in the 1-1 light emission area EA1a between the 1-1 light emission area EA1a and the 1-2 light emission area EA1b, the first repair point RPa can be repaired so that only the 1-2 light emission area EA1b is controlled, thus preventing the occurrence of a dark spot.

[0204] In this case, the repair process can, for example, utilize a laser. By using the laser, the protruding part can be cut off from the upper electrode 200b of the light emission region 1-1 EA1a, thereby interrupting the electrical connection between the upper electrode 200b and the lower electrode 200a.

[0205] As a result of the repair process, light generation from the 1-1 light emission area EA1a is blocked and the display device can be driven normally using light generated from the 1-2 light emission area EA1b.

[0206] Meanwhile, it shows Fig. 10B only applies to the 1-1 light emission range EA1a and the 1-2 light emission range EA1b, but is not limited to this and can be applied equally to the 2-1 light emission range EA2a and the 2-2 light emission range EA2b, the 3-1 light emission range EA3a and the 3-2 light emission range EA3b, as well as the 4-1 light emission range EA4a and the 4-2 light emission range EA4b.

[0207] Fig. Figure 11 is a cross-sectional view of a display device according to a further embodiment of the present disclosure. In this case, it corresponds to Fig. 11 the cross-section III-III' of Fig. 10B. However, the embodiment of Fig. 11, except for the 1-1 light emission range and the 1-2 light emission range, identical to the embodiment of Fig. 4, so that the following description focuses on the differing configuration.

[0208] The display device according to a further embodiment of the present disclosure comprises a first subpixel SP1 with a 1-1 light emission area EA1a and a 1-2 light emission area EA1b. In this case, the first subpixel SP1 comprises a first substrate 100a, a buffer layer 110, an active layer 120, a gate insulating layer 130, a gate electrode 140, an intermediate insulating layer 150, a source electrode 161, a drain electrode 162, a first insulating layer 170, a second insulating layer 180, a lower electrode 200a of the first electrode 200, a planarization layer 190, an upper electrode 200b of the first electrode 200, a bank 210, a light-emitting layer 220, a second electrode 230, an encapsulation layer 240, a color filter 250, a black matrix 260, and a second substrate 100b.

[0209] According to a further embodiment of the present disclosure, the lower electrode 200a can be configured to overlap the entire light-emitting area of ​​the first subpixel SP1. Specifically, the lower electrode 200a can overlap both the 1-1 light emission area EA1a and the 1-2 light emission area EA1b. Therefore, by forming a microcavity for one of the colors red R, green G, and blue B, which is intended to indicate the first subpixel SP1, the light emission efficiency can be improved in the 1-1 light emission area EA1a and in the 1-2 light emission area EA1b by the protruding part 200a1 and the concave part 200a2 of the lower electrode 200a.

[0210] Even if the light emitted by the light-emitting layer 220 arranged in the 1-1 light emission region EA1a and the 1-2 light emission region EA1b is emitted at a predetermined angle with respect to the normal of the upper surface of the light-emitting layer 220, the amount of light emitted outwards from the first subpixel SP1 can be increased by the inclined portion 200a3 of the lower electrode 200a. Accordingly, the light emission efficiency of the first subpixel SP1 can be improved.

[0211] The lower electrode 200a can be configured to overlap the entirety of the 1-1 light emission area EA1a and the 1-2 light emission area EA1b. In this case, the lower electrode 200a can receive a signal sent by the source electrode 161 and apply the same signal via contact hole 2-1 CH2a or contact hole 2-2 CH2b to the upper electrode 200b of light emission area 1-1 EA1a and the upper electrode 200b of light emission area 1-2 EA1b.

[0212] The upper electrode 200b can be structured to correspond to the 1-1 light emission region EA1a and the 1-2 light emission region EA1b. Accordingly, the upper electrode 200b corresponding to the 1-1 light emission region EA1a can be configured to be spaced apart from the upper electrode 200b corresponding to the 1-2 light emission region EA1b, and the upper electrode 200b of the 1-1 light emission region EA1a and the upper electrode 200b of the 1-2 light emission region EA1b can be configured to be spaced apart from each other by bank 210. Furthermore, part of the lower electrode 200a, which is formed jointly in the 1-1 light emission region EA1a and the 1-2 light emission region EA1b, may be exposed by a spacer region between the upper electrode 200b, which is formed in the 1-1 light emission region EA1a, and the upper electrode 200b, which is formed in the 1-2 light emission region EA1b.

[0213] The bank 210 arranged between the 1-1 light emission region EA1a and the 1-2 light emission region EA1b can overlap with the lower electrode 200a, which is arranged throughout the entire area in which the 1-1 light emission region EA1a and the 1-2 light emission region EA1b are formed. The bank 210 arranged between the 1-1 light emission region EA1a and the 1-2 light emission region EA1b can overlap with a portion of the lower electrode 200a, which is formed jointly in the 1-1 light emission region EA1a and the 1-2 light emission region EA1b.

[0214] According to one embodiment of the present disclosure, if a control failure occurs in one of the 1-1 light emission regions EA1a and 1-2 light emission regions EA1b, a repair point can be formed in the upper electrode 200b to interrupt the electrical connection of the light-emitting region in which the failure occurred. For example, the 1-1 light emission region EA1a can have a first repair point RPa and the 1-2 light emission region EA1b can have a second repair point RPb.

[0215] Specifically, the first repair point RPa of the 1-1 light emission area EA1a can be located between the upper electrode 200b of the 1-1 light emission area EA1a, which is not covered by bank 210, and the 2-1 contact hole CH2a. Specifically, the second repair point RPb of the 1-2 light emission area EA1b can be located between the upper electrode 200b of the 1-2 light emission area EA1b, which is not covered by bank 210, and the 2-2 contact hole CH2b.

[0216] For example, if a drive failure occurs in one of the 1-1 light emission regions EA1a and 1-2 light emission regions EA1b, the display device can be driven using only normal pixels by repairing one of the first repair point RPa and one of the second repair point RPb. This can prevent the appearance of dark spots.

[0217] In the event that, for example, a control failure occurs in the 1-1 light emission area EA1a under the 1-1 light emission area EA1a and the 1-2 light emission area EA1b, the first repair point RPa can be repaired so that only the 1-2 light emission area EA1b is controlled, thus preventing the occurrence of a dark spot.

[0218] In this case, the repair process can, for example, utilize a laser. Using the laser, the protruding part can be cut off from the upper electrode 200b of the 1-1 light emission region EA1a, thereby interrupting the electrical connection between the upper electrode 200b and the lower electrode 200a.

[0219] As a result of the repair process, light generation from the 1-1 light emission area EA1a is blocked and the display device can be driven normally using the light generated from the 1-2 light emission area EA1b.

[0220] Meanwhile, it shows Fig. 11 only the 1-1 light emission range EA1a and the 1-2 light emission range EA1b, but is not limited to this and can be applied equally to the 2-1 light emission range EA2a and the 2-2 light emission range EA2b, the 3-1 light emission range EA3a and the 3-2 light emission range EA3b, as well as the 4-1 light emission range EA4a and the 4-2 light emission range EA4b.

[0221] Although the embodiments of the present disclosure have been described in more detail with reference to the accompanying drawings, the present disclosure is not necessarily limited to these embodiments, and various modifications may be made without departing from the technical idea of ​​the present disclosure. Accordingly, the embodiments disclosed in the present disclosure are not intended to limit the technical idea of ​​the present disclosure, but rather to illustrate it, and the scope of the technical idea of ​​the present disclosure is not limited by these embodiments. Therefore, it should be understood that the embodiments described above are in every respect exemplary and not limiting.The scope of protection of the present disclosure should be interpreted in light of the claims, and all technical ideas within an equivalent scope should be interpreted as falling within the scope of protection of the present disclosure.

[0222] According to the disclosure described above, the following effects are achieved.

[0223] According to one embodiment of the present disclosure, the display device comprises a lower electrode, which is a reflective electrode, and an upper electrode, which is a transparent electrode, which are designed to be spaced apart from each other, with a planarization layer arranged between them, and by designing the lower electrode to have a curved shape, the reflection of external light at the inclined part is suppressed and a microcavity is formed for one of red R, green G and blue B light at the protruding part and the concave part, thereby improving the light emission efficiency.

[0224] According to one embodiment of the present disclosure, by forming an open part in an area in which a protruding part of a lower electrode is formed, or in an area in which a concave part is formed, it is possible to prevent or minimize external light entering from outside a display device being reflected at the lower electrode and impairing a user's view.

[0225] According to one embodiment of the disclosure, a lower electrode arranged in a subpixel displaying white W comprises a first projecting part positioned at a height to form a microcavity for red R light, a second projecting part positioned at a height to form a microcavity for green G light, and a concave part positioned at a height to form a microcavity for blue B light, thereby improving the light emission efficiency of a subpixel displaying white W while preventing deterioration of color purity.

[0226] The effects of this disclosure are not limited to those mentioned above, and other, unmentioned effects will be clearly apparent to those skilled in the art from the following description. QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] KR 10-2024-0114907

[0001]

Claims

[1] Display device comprising: a substrate; a first electrode (200) which is arranged on the substrate and comprises an upper electrode (200b) and a lower electrode (200a); a light-emitting layer (220) on the first electrode (200); and a second electrode (230) on the light-emitting layer (220), wherein the lower electrode (200a) has a projecting part (200a1) having a first height (h1) and a concave part (200a2) arranged at a second height (h2), wherein the projecting part (200a1) is spaced apart from the upper electrode (200b). [2] Display device according to claim 1, wherein the lower electrode (200a) further comprises an inclined part (200a3) arranged between the protruding part (200a1) and the concave part (200a2). [3] Display device according to claim 1 or 2, wherein the upper electrode (200b) is a transparent electrode and the lower electrode (200a) is a reflective electrode and / or the upper electrode (200b) has a different shape than the lower electrode (200a), wherein the upper electrode (200b) is preferably planar. [4] Display device according to claim 1, wherein a distance between the protruding part (200a1) of the lower electrode (200a) and the second electrode (230) is a distance at which a microcavity for one of red R, green G and blue B light is formed, and / or a distance between the concave part (200a2) of the lower electrode (200a) and the second electrode (230) is a distance at which the microcavity for one of red R, green G and blue B light is formed, and / or a distance between the concave part (200a2) of the lower electrode (200) and the second electrode (230) is a distance at which the microcavity for another of red R, green G and blue B light is formed. [5] Display device according to one of the preceding claims, wherein the lower electrode (200) further comprises a second projecting part (200a4') which is arranged at a height which differs from that of the projecting part (200a1') and the concave part (200a2'), and wherein a distance between the second projecting part (200a4') and the light-emitting layer (220) is a distance at which the microcavity for further light of red R, green G and blue B light is formed. [6] Display device according to one of the preceding claims, which further comprises several open parts (OP) arranged in one of the protruding part (200a1) and the concave part (200a2). [7] Display device according to any of the preceding claims, further comprising: an insulating layer (180) which is arranged below the lower electrode (200a) and has the same shape as the lower electrode (200a), wherein the insulating layer (180) comprises a first part (181) with a first height (h1) and a second part (183) with a second height (h2), wherein the multiple open parts (OP) preferably expose a section of an upper surface of either the first part (181) or the second part (183). [8] Display device according to any of the preceding claims, further comprising: a planarization layer (190) arranged between the upper electrode (200b) and the lower electrode (200a) to planarize a lower surface of the upper electrode (200b), wherein the planarization layer (190) has a contact hole (CH2) that electrically connects the upper electrode (200b) and the lower electrode (200a). [9] Display device comprising: a substrate (100a) comprising a first subpixel (SP1), a first electrode (200) comprising a first upper electrode (200b) and a first lower electrode (200a); a first light-emitting layer (220) on the first electrode (200); and a second electrode (230) on the first light-emitting layer (220), wherein the first subpixel (SP1) is arranged on the substrate (100a), comprising the first lower electrode (200a): a first projecting part (200a1) and a first concave part (200a2) which is arranged at a height which differs from the height of the first projecting part (200a1), wherein the first projecting part (200a1) is spaced apart from the first upper electrode (200b). [10] Display device according to claim 9, wherein the first subpixel (Sp1) comprises a 1-1 subpixel and a 1-2 subpixel which display the same color, wherein the first lower electrode (200a) located in the 1-1 subpixel and the first lower electrode (200a) located in the 1-2 subpixel are arranged continuously, and wherein the first upper electrode (200a) located in the 1-1 subpixel and the first upper electrode (200a) located in the 1-2 subpixel are spaced apart from each other. [11] Display device according to claim 9 or 10, wherein an upper surface of the first lower electrode (200a) is exposed by a distance between the first upper electrode (200a) of the 1-1 subpixel and the first upper electrode (200b) of the 1-2 subpixel. [12] Display device according to one of claims 9, 10 or 11, further comprising: a second subpixel (SP2) that displays a different color than the first subpixel (SP1), the second subpixel (SP2) comprising: a third electrode arranged on the substrate (100a) comprising a second upper electrode (200b) and a second lower electrode (200a); a second light-emitting layer (220) on the third electrode; and a fourth electrode (230) on the second light-emitting layer (220), wherein the second lower electrode comprises a second projecting part (200a1) and a second concave part (200a2) which is arranged at a different height than the second projecting part (200a1), wherein the second projecting part is spaced apart from the second upper electrode. [13] Display device according to claim 12, wherein a distance between the second light-emitting layer (220) and the second projecting part (200a) is equal to a distance between the first light-emitting layer (220) and either the first projecting part (200a1) or the first concave part (200a2). [14] Display device according to claim 13, wherein a distance between the first projecting part (200a1) of the first lower electrode (200a) arranged in the first subpixel (SP1) and the first light-emitting layer (220) and a distance between the first concave part (200a2) and the first light-emitting layer (220) are distances at which a microcavity is formed for a red R, green G and blue B light, wherein a distance between the second projecting part (200a1) of the second lower electrode (200a) located in the second subpixel (SP2) and the second light-emitting layer (220) is a distance at which a microcavity is formed for one of red R, green G and blue B light, and wherein a distance between the second concave part (200a2) of the second lower electrode (200a) located in the second subpixel (SP2) and the second light-emitting layer (220) is a distance at which a microcavity is formed for further red R, green G and blue B light. [15] Display device according to claim 14, wherein the second subpixel (SP2) further comprises a third projecting part which is arranged at a height which differs from that of the second projecting part (200a1) and the second concave part (200a2), and wherein a distance between the third projecting part and the second light-emitting layer (220) is a distance which forms a microcavity for further red R, green G and blue B light. [16] Display device according to one of the preceding claims, wherein the first subpixel (SP1) displays one of the colors red R, green G and blue B and the second subpixel (SP2) displays white W. [17] Display device according to any one of the preceding claims 12 to 16, wherein a shortest distance between an upper surface of the first lower electrode (200a) and a lower surface of the first upper electrode (200b) is equal to a shortest distance between an upper surface of the second lower electrode (200a) and a lower surface of the second upper electrode (200b). [18] Display device comprising: a substrate (100a); an upper electrode (200b) and a lower electrode (200a) arranged on the substrate (100a); and an insulating layer (180) arranged below the lower electrode (200a), the lower electrode (200a) comprising: a projecting part (200a1) and a concave part (200a2) which is arranged at a different height than the projecting part (200a1); and an open part (OP) that is arranged in the protruding part (200a1) and / or the concave part (200a2) and exposes a section of an upper surface of the insulating layer (180). [19] Display device according to claim 18, further comprising an inclined part (200a3) arranged between the protruding part (200a1) and the concave part (200a2) and / or wherein the open part (OP) is formed by removing part of the lower electrode (200a).

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