Display device

Abstract

The present application relates to a display device. The display device includes a first pixel area, a series pixel area, a capping layer, and a common electrode, the first pixel area includes a first pixel electrode and a first organic light emitting layer, the series pixel area includes a series pixel electrode, a first series organic light emitting layer, and a second series organic light emitting layer, the capping layer includes a first capping layer corresponding to the first organic light emitting layer and a series capping layer corresponding to both the first series organic light emitting layer and the second series organic light emitting layer, and the common electrode is between the first capping layer and the first organic light emitting layer and between the series capping layer and the second series organic light emitting layer. Each of the first capping layer and the series capping layer has a thickness, and the thickness of the series capping layer is less than the thickness of the first capping layer.

Description

Technical Field

[0001] This disclosure generally relates to display devices. More specifically, this disclosure relates to display devices including a cover layer. Background Technology

[0002] The display device includes light-emitting diodes (LEDs), and each LED includes a pixel electrode, a common electrode, and an organic light-emitting layer disposed between the pixel electrode and the common electrode. To improve the current efficiency of the LEDs, functional layers (e.g., hole transfer layers, electron transfer layers, auxiliary layers, etc.) can be further disposed above and below the organic light-emitting layer. However, considering manufacturing costs, process economics, and yield, functional layers are only disposed in some LEDs. Summary of the Invention

[0003] The implementation provides a display device with improved display quality.

[0004] An embodiment of the display device includes: a substrate including normal pixel regions and tandem pixel regions adjacent to the normal pixel regions in a first direction; a first pixel electrode on the substrate and overlapping the normal pixel regions; a tandem pixel electrode in the same layer as the first pixel electrode and overlapping the tandem pixel regions; a first organic light-emitting layer on the first pixel electrode, overlapping the normal pixel regions and emitting light of a first color; a first tandem organic light-emitting layer on the tandem pixel electrodes, overlapping the tandem pixel regions and emitting light of a second color different from the first color; a second tandem organic light-emitting layer on the first tandem organic light-emitting layer, overlapping the tandem pixel regions and emitting light of the second color; a common electrode on the second tandem organic light-emitting layer and overlapping the normal pixel regions and the tandem pixel regions; a first capping layer on the common electrode and overlapping the normal pixel regions; and a tandem capping layer on the common electrode and overlapping the tandem pixel regions. The thickness of the tandem capping layer in a second direction intersecting the first direction may be less than the thickness of the first capping layer in the second direction.

[0005] According to an embodiment, the first capping layer and the tandem capping layers may comprise the same material.

[0006] According to an embodiment, the first capping layer and the tandem capping layers may include organic materials.

[0007] According to an embodiment, the display device may further include a first hole transfer layer on the series pixel electrode and overlapping with the normal pixel region and the series pixel region, and a second hole transfer layer between the first series organic light-emitting layer and the second series organic light-emitting layer and overlapping with the series pixel region.

[0008] According to an embodiment, the display device may further include a first electron transfer layer between the first tandem organic light-emitting layer and the second hole transfer layer and overlapping with the tandem pixel region, and a second electron transfer layer on the second tandem organic light-emitting layer and overlapping with the normal pixel region and the tandem pixel region.

[0009] According to an embodiment, the display device may further include a charge generation layer between the first electron transfer layer and the second hole transfer layer and overlapping with the series pixel region.

[0010] According to the implementation method, the second hole transfer layer, the first electron transfer layer, and the charge generation layer may not overlap with the normal pixel area.

[0011] According to an embodiment, the display device may further include a first inorganic layer on a series capping layer and overlapping with the normal pixel region and the series pixel region, an organic layer on the first inorganic layer, and a second inorganic layer on the organic layer.

[0012] According to an embodiment, the first inorganic layer and the second inorganic layer may include at least one of silicon oxide, silicon nitride, and silicon nitride.

[0013] According to an embodiment, the display device may further include: a second pixel electrode, which is in the same layer as the first pixel electrode and overlaps with the normal pixel area; a second organic light-emitting layer, which is on the second pixel electrode, overlaps with the normal pixel area, and emits light having a third color different from the first color and the second color; and a second capping layer, which is on the common electrode and overlaps with the second organic light-emitting layer.

[0014] According to an embodiment, the thickness of the first capping layer in the second direction may be the same as the thickness of the second capping layer in the second direction.

[0015] According to the implementation, the thickness of the first capping layer in the second direction, the thickness of the second capping layer in the second direction, and the thickness of the series capping layers in the second direction may be different from each other.

[0016] According to an embodiment, the thickness of each of the first capping layer and the second capping layer in the second direction may be greater than the thickness of the series capping layers in the second direction.

[0017] According to the implementation method, the first color can be red, the second color can be blue, and the third color can be green.

[0018] An embodiment of the display device includes a plurality of first emitting diodes, a plurality of series-connected emitting diodes adjacent to the first emitting diodes, and a capping layer on the first emitting diodes and the series-connected emitting diodes. Each of the first emitting diodes may include a first pixel electrode, a first portion of a first hole transfer layer on the first pixel electrode, and a first organic light-emitting layer on the first portion of the first hole transfer layer. Each of the plurality of series-connected emitting diodes may include a series pixel electrode, a second portion of the first hole transfer layer on the series pixel electrode, a first series-connected organic light-emitting layer on the second portion of the first hole transfer layer, a first electron transfer layer on the first series-connected organic light-emitting layer, a second hole transfer layer on the first electron transfer layer, and a second series-connected organic light-emitting layer on the second hole transfer layer. The thickness of the portion of the capping layer overlapping the series-connected emitting diodes may be less than the thickness of the portion of the capping layer overlapping the first emitting diodes.

[0019] According to an embodiment, the display device may further include a plurality of second emitting diodes, which are adjacent to the first emitting diode and include a second pixel electrode, a third portion of the first hole transfer layer, and a second organic light-emitting layer. The number of the first emitting diodes, the number of the second emitting diodes, and the number of emitting diodes connected in series may be the same.

[0020] According to the implementation method, the thickness of the portion of the capping layer that overlaps with the series-connected emitting diode can be less than the thickness of the portion of the capping layer that overlaps with the first emitting diode, and can also be less than the thickness of the portion of the capping layer that overlaps with the second emitting diode.

[0021] According to the embodiment, the thickness of the portion of the capping layer that overlaps with the first emitting diode can be the same as the thickness of the portion of the capping layer that overlaps with the second emitting diode.

[0022] According to the implementation method, the thickness of the portion of the capping layer that overlaps with the first emitting diode and the thickness of the portion of the capping layer that overlaps with the second emitting diode can be different from each other.

[0023] According to an embodiment, the first tandem organic light-emitting layer can emit light having the same color as the second tandem organic light-emitting layer.

[0024] Therefore, one or more embodiments of the display device may include a first emitting diode with a single-stack structure and a series emitting diode with a double-stack structure (e.g., a series structure). Additionally, the display device may include a capping layer on the first emitting diode and the series emitting diode, and the thickness of the portion of the capping layer overlapping the first emitting diode and the portion of the capping layer overlapping the series emitting diode may be adjusted to be different from each other. Therefore, the capping layer can reduce the resonance deviation that may occur between the first emitting diode and the series emitting diode with different structures. As the resonance deviation decreases, the amount of color change for each angle of the series emitting diode can be reduced. In other words, as the resonance deviation decreases, the color shift phenomenon at the side viewing angle can be improved when the display device is viewed from the side. Furthermore, as the resonance deviation decreases, the amount of white change can be improved based on the difference in the thickness of the emitting diodes. Therefore, the process distribution of the thickness difference between the emitting diodes can be reduced. Additionally, since the series emitting diode has a double-stack structure, the current efficiency of the series emitting diode can be improved.

[0025] It will be understood that both the foregoing overview and the following detailed description are exemplary and illustrative, and are intended to provide further explanation of the claimed disclosure. Attached Figure Description

[0026] The accompanying drawings are included to provide a further understanding of this disclosure, and are incorporated in and constitute a part of this specification. The drawings illustrate embodiments of this disclosure and, together with the specification, serve to illustrate this disclosure.

[0027] Figure 1 This is a plan view illustrating an embodiment of the display device.

[0028] Figure 2 This is a cross-sectional view showing an embodiment of the display device.

[0029] Figure 3 and Figure 4 It is shown Figure 2 A cross-sectional view of the implementation of region A.

[0030] Figure 5 and Figure 6 It shows the manufacturing process. Figure 3 A cross-sectional view of an embodiment of a method for displaying a device.

[0031] Figure 7 and Figure 8 It shows the manufacturing process. Figure 3 A cross-sectional view of an embodiment of a method for displaying a device.

[0032] Figure 9 and Figure 10This is a cross-sectional view showing an embodiment of the display device. Detailed Implementation

[0033] The invention will now be described more fully below with reference to the accompanying drawings, which illustrate various embodiments. However, the invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. The same reference numerals denote the same elements throughout the drawings.

[0034] It will be understood that when an element is referred to as relating to another element, such as "on" another element, it can be directly on the other element, or there can be an intervening element between them. Conversely, when an element is referred to as relating to another element, such as "directly on" another element, there is no intervening element.

[0035] It will be understood that while the terms “first,” “second,” “third,” etc., may be used herein to describe various elements, components, regions, layers, and / or parts, these elements, components, regions, layers, and / or parts should not be limited by these terms. These terms are used only to distinguish one element, component, region, layer, or part from another. Therefore, without departing from the teachings herein, “first element,” “first component,” “first region,” “first layer,” or “first part” discussed below may be referred to as a second element, second component, second region, second layer, or second part.

[0036] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting. As used herein, “a,” “an,” “the,” and “at least one” do not indicate a limitation of quantity and are intended to include both the singular and the plural unless the context clearly indicates otherwise. For example, “element” has the same meaning as “at least one element” unless the context clearly indicates otherwise. “At least one” should not be construed as limiting “a” or “an.” “Or” means “and / or.” As used herein, the term “and / or” includes any and all combinations of one or more of the associated listed items. It will also be understood that the terms “comprising” and / or “containing” or “including” and / or “comprising” as used in this specification specify the presence of the stated features, areas, integrals, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, areas, integrals, steps, operations, elements, components, and / or groups thereof.

[0037] Furthermore, relative terms such as “down” or “bottom” and “up” or “top” may be used herein to describe the relationship between one element and another as shown in the figures. It will also be understood that, in addition to the orientations depicted in the figures, relative terms are intended to include different orientations of the device. For example, if a device in one of the figures is flipped, an element described as being “down” to the other elements will be oriented “up” to the other elements. Thus, depending on the specific orientation of the figure, the term “down” can include both “down” and “up” orientations. Similarly, if a device in one of the figures is flipped, an element described as being “below” or “under” the other elements will be oriented “above” the other elements. Thus, the term “below” or “under” can include both “up” and “down” orientations.

[0038] As used herein, “about” or “approximately” includes the value as well as the average of the specific value within an acceptable range of deviations determined by a person skilled in the art, considering the measurement in question and the errors associated with the measurement of the specific quantity (i.e., limitations of the measurement system). For example, “about” may mean within one or more standard deviations, or within ±30%, ±20%, ±10%, or ±5% of the value.

[0039] Unless otherwise specified, all terms used herein (including technical and scientific terms) shall have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure pertains. It will also be understood that terms, such as those defined in commonly used dictionaries, shall be interpreted as having the same meaning as they have in the context of the relevant art and of this disclosure, and shall not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

[0040] Embodiments are described herein with reference to sectional views, which are schematic illustrations of idealized embodiments. Therefore, deviations from the illustrated shapes are expected due to factors such as manufacturing techniques and / or tolerances. Consequently, the embodiments described herein should not be construed as limited to the specific shapes of the regions shown herein, but will include shape deviations, for example, due to manufacturing processes. For instance, regions shown or described as flat may generally have rough and / or non-linear characteristics. Furthermore, sharp corners shown may be rounded. Therefore, the regions shown in the figures are schematic in nature, and their shapes are not intended to represent the precise shapes of the regions, nor are they intended to limit the scope of the claims.

[0041] Because the functional layer is only disposed in some of the light-emitting diodes (LEDs) in an electronic display device, resonance deviation occurs between the LEDs. This resonance deviation increases the amount of color variation at each angle of the LED. Furthermore, the resonance deviation increases the amount of color variation due to differences in the thickness of the functional layer, thereby increasing the process distribution. Therefore, display devices with improved display quality include those that reduce resonance deviation.

[0042] The illustrative, non-limiting embodiments will be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings.

[0043] Figure 1 This is a plan view showing an embodiment of the display device 10.

[0044] Reference Figure 1 The display device 10 may include a plurality of emitting diodes (e.g., a plurality of light-emitting diodes) and a plurality of series emitting diodes (e.g., a plurality of series light-emitting diodes). In an embodiment, for example, the display device 10 may include a first emitting diode PX1 (e.g., a first light-emitting diode), a second emitting diode PX2 (e.g., a second light-emitting diode), and a series emitting diode TPX (e.g., a series light-emitting diode). The first emitting diode PX1, the second emitting diode PX2, and the series emitting diode TPX may be disposed in the display area DA of the display device 10 and may be arranged along a first direction D1. Each of the first emitting diode PX1, the second emitting diode PX2, and the series emitting diode TPX may be provided in multiples, including a plurality of first emitting diodes PX1, a plurality of second emitting diodes PX2, and a plurality of series emitting diodes TPX.

[0045] The thickness direction (e.g., the second direction D2) of the display device 10 and its components may intersect the first direction D1. The second direction D2 may be perpendicular to the first direction D1, but is not limited thereto. The first emitting diode PX1, the second emitting diode PX2, and the series emitting diode TPX may be disposed in the display area DA of the display device 10, and may be arranged along a third direction that intersects each of the first direction D1 and the second direction D2, but is not limited thereto.

[0046] The non-display area NDA of the display device 10 may be adjacent to the display area DA, and a driver may be disposed in the non-display area NDA. The driver may provide electrical signals, such as drive signals (e.g., gate signals and data voltages), to the first emitting diode PX1, the second emitting diode PX2, and the series emitting diode TPX. In an embodiment, the non-display area NDA may be positioned around the display area DA.

[0047] The first emitting diode PX1 can generate and / or emit light of a first color, the second emitting diode PX2 can generate and / or emit light of a second color, and the series emitting diode TPX can generate and / or emit light of a third color. When the light of the first color, the light of the second color, and the light of the third color are combined, the display device 10 can display a desired image. In an embodiment, the number of first emitting diodes PX1, the number of second emitting diodes PX2, and the number of series emitting diodes TPX can be the same.

[0048] Figure 2 This is a cross-sectional view illustrating an embodiment of the display device 11. In the embodiment, for example, Figure 2 It can be along Figure 1 A sectional view taken by line I-I'.

[0049] Reference Figure 1 and Figure 2 The display device 11 may include a substrate SUB, a buffer layer BFR, a first active pattern ACT1, a second active pattern ACT2 and a third active pattern ACT3, a gate insulating layer GI, a first gate electrode GAT1, a second gate electrode GAT2 and a third gate electrode GAT3, an interlayer insulating layer ILD, a first source electrode SE1, a second source electrode SE2 and a third source electrode SE3, a first drain electrode DE1, a second drain electrode DE2 and a third drain electrode DE3, a via insulating layer VIA, a first emitting diode PX1, a second emitting diode PX2, a series emitting diode TPX, a first capping layer 170, a second capping layer 270, a series capping layer 370, a passivation layer 180, a first inorganic layer 191, an organic layer 192 and a second inorganic layer 193.

[0050] The first emitting diode PX1 may include a first pixel electrode 110, a first emitting layer 130, and a first portion of a common electrode 150; the second emitting diode PX2 may include a second pixel electrode 210, a second emitting layer 230, and a second portion of a common electrode 150; and the series emitting diode TPX (e.g., a third emitting diode) may include a series pixel electrode 310 (e.g., a third pixel electrode), a series emitting layer 330 (e.g., a third emitting layer), and a third portion of a common electrode 150.

[0051] The first pixel electrode 110, the second pixel electrode 210, and the third pixel electrode 310 may be in the same layer as each other. When the elements are in the same layer, they may be corresponding portions or corresponding patterns of the same material layer on the substrate SUB. More than one pixel electrode may define a pixel electrode layer together.

[0052] The first emitting diode PX1 and the second emitting diode PX2 may overlap or correspond to the normal pixel region NPA, and the series emitting diode TPX may overlap or correspond to the series pixel region TPA. Specifically, the first emitting diode PX1 may overlap or correspond to the first pixel region PA1 of the normal pixel region NPA, and the second emitting diode PX2 may overlap or correspond to the second pixel region PA2 of the normal pixel region NPA. The first pixel region PA1, the second pixel region PA2, and the series pixel region TPA may be adjacent to each other in the first direction D1. That is, the first pixel region PA1, the second pixel region PA2, and the series pixel region TPA may be arranged sequentially along the first direction D1, but are not limited thereto.

[0053] The substrate SUB may include glass, quartz, plastic, etc. In one embodiment, the substrate SUB may include glass, and the display device 11 may be a rigid display device. In another embodiment, the substrate SUB may include plastic such as polyimide, and the display device 11 may be a flexible display device.

[0054] The buffer layer (BFR) can be disposed on the substrate (SUB). In an embodiment, for example, the buffer layer (BFR) may comprise silicon oxide ("SiO2"). x ), silicon nitride ("SiN") x The buffer layer (BFR) can reduce or effectively prevent the diffusion of metal atoms or impurities into the first active pattern ACT1, the second active pattern ACT2, and the third active pattern ACT3. Furthermore, the buffer layer (BFR) can regulate the thermal rate supplied to the first active pattern ACT1, the second active pattern ACT2, and the third active pattern ACT3 during the crystallization process used to provide or form the first active pattern ACT1, the second active pattern ACT2, and the third active pattern ACT3.

[0055] The first active pattern ACT1 can be disposed on the buffer layer BFR. The first active pattern ACT1 can include silicon semiconductor. In an embodiment, for example, the first active pattern ACT1 can include amorphous silicon, polycrystalline silicon, etc. The second active pattern ACT2 and the third active pattern ACT3 can be disposed on the buffer layer BFR and can include the same material as the first active pattern ACT1.

[0056] The gate insulating layer GI can be disposed on the buffer layer BFR and can cover the first active pattern ACT1, the second active pattern ACT2, and the third active pattern ACT3. In an embodiment, the gate insulating layer GI may include an insulating material. In an embodiment, for example, the gate insulating layer GI may include silicon oxide ("SiO2"). x ), silicon nitride ("SiN") xSilicon nitride oxide ("SiON"), etc.

[0057] A first gate electrode GAT1 may be disposed on the gate insulating layer GI. The first gate electrode GAT1 may overlap with a first active pattern ACT1. In response to an electrical signal, such as a gate signal provided to the first gate electrode GAT1, an electrical signal and / or voltage may be transmitted through the first active pattern ACT1.

[0058] In an embodiment, the first gate electrode GAT1 may include a metal, an alloy, a metal oxide, a conductive material, etc. For example, the first gate electrode GAT1 may include silver (“Ag”), silver-containing alloys, molybdenum (“Mo”), molybdenum-containing alloys, aluminum (“Al”), aluminum-containing alloys, aluminum nitride (“AlN”), tungsten (“W”), tungsten nitride (“WN”), copper (“Cu”), nickel (“Ni”), chromium (“Cr”), chromium nitride (“CrN”), titanium (“Ti”), tantalum (“Ta”), platinum (“Pt”), scandium (“Sc”), indium tin oxide (“ITO”), indium zinc oxide (“IZO”), etc.

[0059] The second gate electrode GAT2 and the third gate electrode GAT3 can be disposed on the gate insulating layer GI and can include the same material as the first gate electrode GAT1.

[0060] An interlayer insulating layer (ILD) can be disposed on the gate insulating layer (GI) and can cover the first gate electrode (GAT1), the second gate electrode (GAT2), and the third gate electrode (GAT3). In an embodiment, the interlayer insulating layer (ILD) may include an insulating material. For example, in an embodiment, the interlayer insulating layer (ILD) may include silicon oxide ("SiO2"). x ), silicon nitride ("SiN") x Silicon nitride oxide ("SiON"), etc.

[0061] The first source electrode SE1 can be disposed on the interlayer insulating layer ILD. The first source electrode SE1 can contact the first active pattern ACT1. In an embodiment, the first source electrode SE1 can include a metal, alloy, metal oxide, conductive material, etc. In an embodiment, for example, the first source electrode SE1 can include silver (“Ag”), silver-containing alloy, molybdenum (“Mo”), molybdenum-containing alloy, aluminum (“Al”), aluminum-containing alloy, aluminum nitride (“AlN”), tungsten (“W”), tungsten nitride (“WN”), copper (“Cu”), nickel (“Ni”), chromium (“Cr”), chromium nitride (“CrN”), titanium (“Ti”), tantalum (“Ta”), platinum (“Pt”), scandium (“Sc”), indium tin oxide (“ITO”), indium zinc oxide (“IZO”), etc.

[0062] The second source electrode SE2 and the third source electrode SE3 can be disposed on the interlayer insulating layer ILD and can include the same material as the first source electrode SE1.

[0063] The first drain electrode DE1 may be disposed on the interlayer insulating layer (ILD). The first drain electrode DE1 may contact the first active pattern ACT1. In an embodiment, for example, data voltage may be transmitted to the first active pattern ACT1 through the first source electrode SE1, and electrical drive current may be transmitted to the first pixel electrode 110 through the first drain electrode DE1. The first drain electrode DE1 may comprise the same material as the first source electrode SE1.

[0064] The second drain electrode DE2 and the third drain electrode DE3 can be disposed on the interlayer insulating layer ILD and can include the same material as the first source electrode SE1.

[0065] The corresponding active pattern, the corresponding gate electrode, the corresponding source electrode, and the corresponding drain electrode may, together with a portion of the gate insulating layer GI and a portion of the interlayer insulating layer ILD, define a transistor connected to the corresponding emitter diode, but are not limited thereto.

[0066] The via insulating layer (VIA) can be disposed on the interlayer insulating layer (ILD) and can cover the source and drain electrodes. In embodiments, the via insulating layer (VIA) can include an organic insulating material. Therefore, the via insulating layer (VIA) can have a substantially flat top surface. In embodiments, for example, the via insulating layer (VIA) can include photoresist, polyacrylic resin, polyimide resin, acrylic resin, etc.

[0067] Reference Figure 3 and Figure 4 The first pixel electrode 110, the second pixel electrode 210, the series pixel electrode 310, the pixel limiting layer PDL, the first emission layer 130, the second emission layer 230, the series emission layer 330, the common electrode 150, the first capping layer 170, the second capping layer 270, and the series capping layer 370 are described.

[0068] A first inorganic layer 191 may be disposed on the passivation layer 180. In an embodiment, the first inorganic layer 191 may include an inorganic material and may be disposed along the contour of the passivation layer 180. In an embodiment, for example, the first inorganic layer 191 may include silicon oxide ("SiO2"). x ), silicon nitride ("SiN") x Silicon nitride oxide ("SiON"), etc.

[0069] The first inorganic layer 191 can reduce or effectively prevent oxygen and / or moisture from penetrating into the various emitting diodes and other layers beneath it. Therefore, the first inorganic layer 191 can reduce or effectively prevent the degradation of the first emitting diode PX1, the second emitting diode PX2, and the series emitting diode TPX. Furthermore, the first inorganic layer 191 can protect the first emitting diode PX1, the second emitting diode PX2, and the series emitting diode TPX from the effects of shock.

[0070] An organic layer 192 may be disposed on the first inorganic layer 191. In embodiments, the organic layer 192 may comprise an organic material and may have a substantially flat top surface. In embodiments, for example, the organic layer 192 may comprise a photoresist, polyacrylic acid resin, polyimide resin, acrylic resin, etc. The organic layer 192 may reduce or effectively prevent crack propagation to other layers beneath the organic layer 192.

[0071] A second inorganic layer 193 may be disposed on the organic layer 192. The second inorganic layer 193 may face the first inorganic layer 191, and the organic layer 192 is located between the second inorganic layer 193 and the first inorganic layer 191. In an embodiment, the second inorganic layer 193 may include an inorganic material. In an embodiment, for example, the second inorganic layer 193 may include silicon oxide ("SiO2"). x ), silicon nitride ("SiN") x The first inorganic layer 191, the organic layer 192, and the second inorganic layer 193 can together define the encapsulation layer.

[0072] Figure 3 and Figure 4 It is shown Figure 2 A cross-sectional view of the implementation of region A. Figure 3 and Figure 4 It can be shown as including Figure 2 A cross-sectional view of the first emitting diode PX1, the second emitting diode PX2, the series emitting diode TPX, the first capping layer 170, the second capping layer 270, and the series capping layer 370 in the display device 11.

[0073] Reference Figure 2 , Figure 3 and Figure 4The first pixel electrode 110 (ANODE1) can be disposed on the via insulating layer VIA and can overlap with the first pixel region PA1. The first pixel electrode 110 can contact the first drain electrode DE1 and can receive an electrically driven current. In embodiments, the first pixel electrode 110 can include metals, alloys, metal oxides, reflective conductive materials, etc. In embodiments, for example, the first pixel electrode 110 can include silver (“Ag”), silver-containing alloys, molybdenum (“Mo”), molybdenum-containing alloys, aluminum (“Al”), aluminum-containing alloys, aluminum nitride (“AlN”), tungsten (“W”), tungsten nitride (“WN”), copper (“Cu”), nickel (“Ni”), chromium (“Cr”), chromium nitride (“CrN”), titanium (“Ti”), tantalum (“Ta”), platinum (“Pt”), scandium (“Sc”), indium tin oxide (“ITO”), indium zinc oxide (“IZO”), etc. In embodiments, the first pixel electrode 110 can have an ITO / Ag / ITO structure.

[0074] The second pixel electrode 210 (ANODE2) can be disposed on the through-hole insulating layer VIA and can overlap with the second pixel region PA2. The series pixel electrode 310 (ANODE3) can be disposed on the through-hole insulating layer VIA and can overlap with the series pixel region TPA. The second pixel electrode 210 and the series pixel electrode 310 can make up the same material as the first pixel electrode 110.

[0075] A pixel defining layer (PDL) can be disposed on the via insulating layer (VIA) and can define the boundary of each pixel region in one direction along the substrate (SUB). Furthermore, the pixel defining layer (PDL) may include or define an opening exposing the upper surface of a pixel electrode, and an emitter layer may be disposed in or extend into the opening of the pixel defining layer (PDL). Specifically, the pixel defining layer (PDL) may include a first opening exposing the upper surface of a first pixel electrode 110, and a first emitter layer 130 may be disposed in the first opening. Furthermore, the pixel defining layer (PDL) may include a second opening exposing the upper surface of a second pixel electrode 210, and a second emitter layer 230 may be disposed in the second opening. Additionally, the pixel defining layer (PDL) may include a third opening exposing the upper surface of a series pixel electrode 310, and a series emitter layer 330 may be disposed in the third opening.

[0076] The first emission layer 130 may be disposed on the first pixel electrode 110 and may overlap with the first pixel region PA1. The first emission layer 130 may include a first portion of a first hole transfer layer 331 (HTL1), a first auxiliary layer 131 (RIL), a first organic light-emitting layer 132 (REML), and a first portion of a second electron transfer layer 133 (ETL2).

[0077] The second emission layer 230 may be disposed on the second pixel electrode 210 and may overlap with the second pixel region PA2. The second emission layer 230 may include a second portion of the first hole transfer layer 331, a second auxiliary layer 231 (GIL), a second organic light-emitting layer 232 (GEML), and a second portion of the second electron transfer layer 133.

[0078] The tandem emitter layer 330 can be disposed on the tandem pixel electrode 310 and can overlap with the tandem pixel region TPA. The tandem emitter layer 330 may include a third portion of the first hole transfer layer 331, a first tandem auxiliary layer 332 (BIL1), a first tandem organic light-emitting layer 333 (BEML1), a first electron transfer layer 334 (ETL1), a charge generation layer 335 (CGL), a second hole transfer layer 336 (HTL2), a second tandem auxiliary layer 337 (BIL2), a second tandem organic light-emitting layer 338 (BEML2), and a third portion of the second electron transfer layer 333.

[0079] The first hole transfer layer 331 can be disposed on the first pixel electrode 110, the second pixel electrode 210, and the tandem pixel electrode 310, and can overlap with each of the normal pixel region NPA and the tandem pixel region TPA. In other words, the first hole transfer layer 331 can be commonly disposed or formed in the display region DA. The first hole transfer layer 331 can increase the migration rate of holes toward the first organic light-emitting layer 132. In an embodiment, the first hole transfer layer 331 may include a hole transfer material. In an embodiment, for example, the first hole transfer layer 331 may include at least one of HATCN (1,4,5,8,9,11-hexaazatriphenyl-hexanonitrile), CuPc (copper phthalocyanine), PEDOT (poly(3,4)-ethylenedioxythiophene), PANI (polyaniline), and NPD (N,N-dinaphthyl-N,N'-diphenylbenzidine).

[0080] The first auxiliary layer 131 may be disposed on the first hole transfer layer 331 and may overlap with the first pixel region PA1. The first auxiliary layer 131 may enhance the resonance of light emitted from the first organic light-emitting layer 132. In an embodiment, the first auxiliary layer 131 may include an amine-based organic compound, and the resonance may be enhanced by adjusting the thickness of the first auxiliary layer 131. In an embodiment, the first auxiliary layer 131 may include a metal with high reflectivity (such as Ag and MgAg) and a material for adjusting the optical path (such as SiN). x SiO x , TiO2, Ta2O5, ITO and IZO).

[0081] The first organic light-emitting layer 132 may be disposed on the first auxiliary layer 131 and may overlap with the first pixel region PA1. When electrons and holes are injected into the first organic light-emitting layer 132, the first organic light-emitting layer 132 may emit light having a first color. In an embodiment, for example, the first color may be red, and the first organic light-emitting layer 132 may include an organic material that emits red light.

[0082] The second auxiliary layer 231 can be disposed on the first hole transfer layer 331 and can overlap with the second pixel region PA2. The second auxiliary layer 231 can enhance the resonance of light emitted from the second organic light-emitting layer 232. In an embodiment, the second auxiliary layer 231 may include an amine-based organic compound, and the resonance can be enhanced by adjusting the thickness of the second auxiliary layer 231. In an embodiment, the second auxiliary layer 231 may include a metal with high reflectivity (such as Ag and MgAg) and a material for adjusting the optical path (such as SiN). x SiO x , TiO2, Ta2O5, ITO, IZO, etc.).

[0083] The second organic light-emitting layer 232 can be disposed on the second auxiliary layer 231 and can overlap with the second pixel region PA2. When electrons and holes are injected into the second organic light-emitting layer 232, the second organic light-emitting layer 232 can emit light with a second color. In an embodiment, for example, the second color can be green, and the second organic light-emitting layer 232 can include an organic material that emits green light.

[0084] The first tandem auxiliary layer 332 may be disposed on the first hole transfer layer 331 and may overlap with the tandem pixel region TPA. The first tandem auxiliary layer 332 may enhance the resonance of light emitted from the first tandem organic light-emitting layer 333. In an embodiment, the first tandem auxiliary layer 332 may include an amine-based organic compound, and the resonance can be enhanced by adjusting the thickness of the first tandem auxiliary layer 332. In an embodiment, the first tandem auxiliary layer 332 may include a metal with high reflectivity (such as Ag and MgAg) and a material for adjusting the optical path (such as SiN). x SiO x , TiO2, Ta2O5, ITO and IZO).

[0085] The first tandem organic light-emitting layer 333 can be disposed on the first tandem auxiliary layer 332 and can overlap with the tandem pixel region TPA. When electrons and holes are injected into the first tandem organic light-emitting layer 333, the first tandem organic light-emitting layer 333 can emit light with a third color. In an embodiment, for example, the third color can be blue, and the first tandem organic light-emitting layer 333 can include an organic material that emits blue light.

[0086] However, the first to third colors are not limited to the colors described above. In an embodiment, for example, the first color may be green, the second color may be blue, and the third color may be red.

[0087] A first electron transfer layer 334 may be disposed on the first tandem organic light-emitting layer 333 and may overlap with the tandem pixel region TPA. In an embodiment, the first electron transfer layer 334 may not overlap with the normal pixel region NPA. When configured not to overlap with a component or region, the element may be excluded from and / or spaced apart from the component or region. The first electron transfer layer 334 may increase the electron mobility toward the first tandem organic light-emitting layer 333. In an embodiment, the first electron transfer layer 334 may include an electron transfer material. In an embodiment, for example, the first electron transfer layer 334 may include at least one of LiQ (8-hydroxyquinoline-lithium), Alq3 (tris(8-hydroxyquinoline)aluminum), PBD (2-(4-biphenyl)-5-(4-tert-butylphenyl)-1,3,4-oxadiazole), TAZ, and spiro-PBD.

[0088] The charge generation layer 335 can be disposed on the first electron transfer layer 334 and can overlap with the tandem pixel region TPA. In an embodiment, the charge generation layer 335 may not overlap with the normal pixel region NPA. The charge generation layer 335 can increase the electron mobility toward the first tandem organic light-emitting layer 333 and can increase the hole mobility toward the second tandem organic light-emitting layer 338. In an embodiment, the charge generation layer 335 may include an n-type charge generation layer disposed on the first electron transfer layer 334 and a p-type charge generation layer disposed on the n-type charge generation layer, and may have an NP junction structure.

[0089] The second hole transfer layer 336 may be disposed on the charge generation layer 335 and may overlap with the tandem pixel region TPA. In an embodiment, the second hole transfer layer 336 may not overlap with the normal pixel region NPA. The second hole transfer layer 336 may increase the migration rate of holes toward the second tandem organic light-emitting layer 338. In an embodiment, the second hole transfer layer 336 may include a hole transfer material. In an embodiment, for example, the second hole transfer layer 336 may include at least one of HATCN (1,4,5,8,9,11-hexaazatriphenyl-hexanonitrile), CuPc (copper phthalocyanine), PEDOT (poly(3,4)-ethylenedioxythiophene), PANI (polyaniline), and NPD (N,N-dinaphthyl-N,N'-diphenylbenzidine).

[0090] The second tandem auxiliary layer 337 can be disposed on the second hole transfer layer 336 and can overlap with the tandem pixel region TPA. The second tandem auxiliary layer 337 can enhance the resonance of light emitted from the second tandem organic light-emitting layer 338. In an embodiment, the second tandem auxiliary layer 337 may include an amine-based organic compound, and the resonance can be enhanced by adjusting the thickness of the second tandem auxiliary layer 337. In an embodiment, the second tandem auxiliary layer 337 may include a metal with high reflectivity (such as Ag and MgAg) and a material for adjusting the optical path (such as SiN). x SiO x , TiO2, Ta2O5, ITO, IZO, etc.).

[0091] The second tandem organic light-emitting layer 338 can be disposed on the second tandem auxiliary layer 337 and can overlap with the tandem pixel region TPA. When electrons and holes are injected into the second tandem organic light-emitting layer 338, the second tandem organic light-emitting layer 338 can emit light with a third color. In an embodiment, for example, the third color can be blue, and the second tandem organic light-emitting layer 338 can include an organic material that emits blue light.

[0092] The second electron transfer layer 133 can be disposed on the first organic light-emitting layer 132, the second organic light-emitting layer 232, and the second tandem organic light-emitting layer 338, and can overlap with both the normal pixel region NPA and the tandem pixel region TPA. In other words, the second electron transfer layer 133 can be commonly disposed or formed in the display region DA. The second electron transfer layer 133 can increase the electron mobility toward the first organic light-emitting layer 132, the second organic light-emitting layer 232, and the second tandem organic light-emitting layer 338. In an embodiment, the second electron transfer layer 133 may include an electron transfer material. In an embodiment, for example, the second electron transfer layer 133 may include at least one of LiQ (8-hydroxyquinoline-lithium), AlQ3 (tris(8-hydroxyquinoline)aluminum), PBD (2-(4-biphenyl)-5-(4-tert-butylphenyl)-1,3,4-oxadiazole), TAZ, and spiro-PBD.

[0093] In an implementation, the series-connected emitting diode TPX can have a double-stacked structure (e.g., a series structure). See reference... Figure 4For example, the third portion of the first hole transfer layer 331, the first series auxiliary layer 332, the first series organic light-emitting layer 333, and the first electron transfer layer 334 can constitute a first stacked structure STK1. The second hole transfer layer 336, the second series auxiliary layer 337, the second series organic light-emitting layer 338, and the third portion of the second electron transfer layer 133 can constitute a second stacked structure STK2. Since the series-emitter diode TPX has a double-stacked structure, the current efficiency of the series-emitter diode TPX can be improved.

[0094] In one implementation, for example, while the series-connected emitting diode TPX has a double-stacked structure, the first emitting diode PX1 (or the second emitting diode PX2) may have a single-stacked structure.

[0095] The common electrode 150 (CATHODE) can be disposed on the second electron transfer layer 133 and can overlap with both the normal pixel region NPA and the series pixel region TPA. The common electrode 150 can include metals, alloys, metal oxides, transparent conductive materials, etc. In embodiments, for example, the common electrode 150 can include silver (“Ag”), silver-containing alloys, molybdenum (“Mo”), molybdenum-containing alloys, aluminum (“Al”), aluminum-containing alloys, aluminum nitride (“AlN”), tungsten (“W”), tungsten nitride (“WN”), copper (“Cu”), nickel (“Ni”), chromium (“Cr”), chromium nitride (“CrN”), titanium (“Ti”), tantalum (“Ta”), platinum (“Pt”), scandium (“Sc”), indium tin oxide (“ITO”), indium zinc oxide (“IZO”), etc.

[0096] A first capping layer 170 (CPL1) can be disposed on the common electrode 150 and can overlap with the first pixel region PA1. By using the refractive index of the first capping layer 170, light emitted from the first organic light-emitting layer 132 can be made to resonate, and the light extraction efficiency of the first emitting diode PX1 can be improved. In an embodiment, for example, the first capping layer 170 may include an organic material. Furthermore, the first capping layer 170 may have a constant thickness over the entire first pixel region PA1 and may be disposed along the contour of the common electrode 150.

[0097] The second capping layer 270 (CPL2) can be disposed on the common electrode 150 and can overlap with the second pixel region PA2. By using the refractive index of the second capping layer 270, the light emitted from the second organic light-emitting layer 232 can be made to resonate, and the light extraction efficiency of the second emitting diode PX2 can be improved. In an embodiment, for example, the second capping layer 270 may include an organic material. Furthermore, the second capping layer 270 may have a constant thickness over the entire second pixel region PA2 and may be disposed along the contour of the common electrode 150.

[0098] A tandem capping layer 370 (TCPL) can be disposed on the common electrode 150 and can overlap with the tandem pixel region TPA. By using the refractive index of the tandem capping layer 370, light emitted from the first tandem organic light-emitting layer 333 and the second tandem organic light-emitting layer 338 can be made to resonate, and the light extraction efficiency of the tandem emitting diode TPX can be improved. In an embodiment, for example, the tandem capping layer 370 may comprise an organic material. Furthermore, the tandem capping layer 370 may have a constant thickness over the entire tandem pixel region TPA and may be disposed along the contour of the common electrode 150.

[0099] The first capping layer 170 may have a first thickness TH1 along a second direction D2 intersecting the first direction D1. The second capping layer 270 may have a second thickness TH2 along the second direction D2. The tandem capping layer 370 may have a third thickness TH3 along the second direction D2. In an embodiment, the first thickness TH1 and the second thickness TH2 may be the same, and the third thickness TH3 may be less than the first thickness TH1. The first capping layer 170, the second capping layer 270, and the tandem capping layer 370 may be corresponding portions of the capping layers of the display device 11. The first capping layer 170, the second capping layer 270, and the tandem capping layer 370 may be corresponding portions of the same material layer defining the capping layers of the display device 11 on the substrate SUB.

[0100] As described above, while the series-emitter diode TPX has a double-stacked structure, the first emitter diode PX1 (or the second emitter diode PX2) can have a single-stacked structure. Therefore, a resonance deviation may occur between the resonance level of the light emitted from the first emitter diode PX1 (or the second emitter diode PX2) and the resonance level of the light emitted from the series-emitter diode TPX. However, since the series capping layer 370 is configured or formed such that the third thickness TH3 is less than the first thickness TH1 (or the second thickness TH2), the resonance deviation can be reduced. In various pixel regions, the number of stacks within the corresponding emitter diodes in the corresponding pixel region can be opposite to the corresponding thickness of the capping layer in the corresponding pixel region. In other words, to reduce the resonance deviation, the thickness of the various capping layers included in the display device 11 can be differentially adjusted. As the resonance deviation decreases, the amount of color change for each angle of the series-emitter diode TPX can be reduced, and the white angle dependence (“WAD”) of the display device 11 can be improved. In other words, as the resonance deviation decreases, the color shift phenomenon at the side viewing angle can be improved when the display device 11 is viewed from the side.

[0101] Figure 5 and Figure 6 It shows the manufacturing process. Figure 3 A cross-sectional view of an embodiment of the method of display device 11.

[0102] Reference Figure 3 and Figure 5 A through-hole can be provided or formed through the through-hole insulating layer VIA, and the first pixel electrode 110, the second pixel electrode 210, and the series pixel electrode 310 can be provided or formed together (e.g., simultaneously provided or formed, provided or formed with the same process, provided or formed as corresponding patterns of the same material layer, etc.). Therefore, the first pixel electrode 110, the second pixel electrode 210, and the series pixel electrode 310 can include the same material.

[0103] Additionally, a pixel-defining layer (PDL) can be provided or formed on the upper surface of the exposed pixel electrode, and a first hole transfer layer 331 can be integrally provided or formed in the display area (DA). In an embodiment, for example, an aperture mask can be used to deposit the first hole transfer layer 331.

[0104] Furthermore, the first auxiliary layer 131 and the first organic light-emitting layer 132 can be configured or formed to overlap with the first pixel region PA1, and the second auxiliary layer 231 and the second organic light-emitting layer 232 can be configured or formed to overlap with the second pixel region PA2. The first series auxiliary layer 332, the first series organic light-emitting layer 333, the first electron transfer layer 334, the charge generation layer 335, the second hole transfer layer 336, the second series auxiliary layer 337, and the second series organic light-emitting layer 338 can be configured or formed to overlap with the series pixel region TPA. Additionally, the second electron transfer layer 133 and the common electrode 150 can be integrally formed in the display region DA.

[0105] In this embodiment, the first preliminary capping layer 170', the second preliminary capping layer 270', and the tandem capping layer 370 can be disposed or formed together. In this embodiment, for example, the first preliminary capping layer 170', the second preliminary capping layer 270', and the tandem capping layer 370 can be disposed using an opening mask having an opening corresponding to the display area DA. Therefore, the first preliminary capping layer 170', the second preliminary capping layer 270', and the tandem capping layer 370 can have the same thickness as the third thickness TH3. The third thickness TH3 can be the preliminary thickness of the first preliminary capping layer 170' and the second preliminary capping layer 270'.

[0106] Reference Figure 3 and Figure 6 The first capping layer 170 and the second capping layer 270 may be disposed or formed together. In an embodiment, for example, a fine metal mask (“FMM”) having openings corresponding to normal pixel areas NPA can be used (e.g., in...). Figure 6 The mask is set by the horizontal line indicating the break at the NPA in the normal pixel area (see reference). Figure 6(See the down arrow in the image) First capping layer 170 and second capping layer 270. Therefore, the first capping layer 170 and the second capping layer 270 may have a final thickness of a first thickness TH1 (or a second thickness TH2), which is greater than a third thickness TH3 and includes the initial thickness of the third thickness TH3. Alternatively, the first capping layer 170 and the second capping layer 270 may have the same thickness (e.g., first thickness TH1 or second thickness TH2).

[0107] Figure 7 and Figure 8 It shows the manufacturing process. Figure 3 A cross-sectional view of an embodiment of the method of display device 11.

[0108] Reference Figure 3 and Figure 7 The common electrode 150 can be integrally disposed or formed within the display area DA. In an embodiment, for example, the manufacturing method of the component disposed below the common electrode 150 can be the same as described in the reference. Figure 5 The descriptions are basically the same.

[0109] In an embodiment, the first capping layer 170 and the second capping layer 270 may be disposed or formed together. In an embodiment, for example, the first capping layer 170 and the second capping layer 270 may be deposited using an aperture mask (or a fine metal mask) having an opening corresponding to a normal pixel area NPA (e.g., in...). Figure 7 (The mask is indicated by a horizontal line that breaks at the normal pixel area NPA). Therefore, the first capping layer 170 and the second capping layer 270 can have the same first thickness TH1 (or second thickness TH2).

[0110] Reference Figure 3 and Figure 8 A series capping layer 370 can be set or formed. In an embodiment, for example, a fine metal mask having openings corresponding to the series pixel regions TPA can be used (e.g., in...). Figure 8 A tandem capping layer 370 is deposited using a mask (indicated by a horizontal line broken at the tandem pixel region TPA). Therefore, the tandem capping layer 370 can have a third thickness TH3 that is less than the first thickness TH1. That is, multiple capping layers of different overall thicknesses are formed individually or through separate mask processes.

[0111] Figure 9 and Figure 10 This is a cross-sectional view showing an embodiment of the display device 12.

[0112] Reference Figure 2 , Figure 9 and Figure 10Since the display device 12 is substantially the same as the display device 11 except for the first cover layer 470, the second cover layer 570 and the series cover layer 670, the repeated description will be omitted.

[0113] The first capping layer 470 can be disposed on the common electrode 150 and can overlap with the first pixel region PA1. By using the refractive index of the first capping layer 470, the light emitted from the first organic light-emitting layer 132 can be made to resonate, and the light extraction efficiency of the first emitting diode PX1 can be improved. In an embodiment, for example, the first capping layer 470 may include an organic material. Furthermore, the first capping layer 470 may have a constant thickness and can be disposed along the contour of the common electrode 150.

[0114] The second capping layer 570 can be disposed on the common electrode 150 and can overlap with the second pixel region PA2. By using the refractive index of the second capping layer 570, the light emitted from the second organic light-emitting layer 232 can be made to resonate, and the light extraction efficiency of the second emitting diode PX2 can be improved. In an embodiment, for example, the second capping layer 570 may include an organic material. In addition, the second capping layer 570 may have a constant thickness and may be disposed along the contour of the common electrode 150.

[0115] A series capping layer 670 can be disposed on the common electrode 150 and can overlap with the series pixel region TPA. By using the refractive index of the series capping layer 670, light emitted from the first series organic light-emitting layer 333 and the second series organic light-emitting layer 338 can be made to resonate, and the light extraction efficiency of the series emitting diode TPX can be improved. In an embodiment, for example, the series capping layer 670 may include an organic material. Furthermore, the series capping layer 670 can have a constant thickness and can be disposed along the contour of the common electrode 150.

[0116] The first capping layer 470 may have a first thickness TH1 along the second direction D2. The second capping layer 570 may have a second thickness TH2 along the second direction D2. The tandem capping layer 670 may have a third thickness TH3 along the second direction D2. In an embodiment, the first thickness TH1, the second thickness TH2, and the third thickness TH3 may be different from each other. The first thickness TH1, the second thickness TH2, and the third thickness TH3 may be appropriately set based on the emitted light of the first color, the second color, and the third color of the corresponding pixel region. In an embodiment, for example, the third thickness TH3 may be less than the second thickness TH2, and the second thickness TH2 may be less than the first thickness TH1.

[0117] Although embodiments and implementations are described herein, other embodiments and modifications will be apparent from the description. Therefore, this disclosure is not limited to such embodiments, but rather to the broader scope of the appended claims and various obvious modifications and equivalent arrangements that will be apparent to those skilled in the art.

Claims

1. A display device comprising a first pixel region and a series pixel region adjacent to each other, the display device comprising: The first pixel electrode is located in the first pixel region; as well as A first organic light-emitting layer emits light of a first color in the first pixel region; A series pixel electrode, in the same layer as the first pixel electrode in the series pixel region; A first tandem organic light-emitting layer emits light of a second color different from the first color in the tandem pixel region; as well as A second tandem organic light-emitting layer is located in the tandem pixel region, facing the tandem pixel electrode, and the first tandem organic light-emitting layer is located between the second tandem organic light-emitting layer and the tandem pixel electrode, and the second tandem organic light-emitting layer emits light having the second color; The capping layer includes: The first capping layer, in the first pixel region, corresponds to the first organic light-emitting layer, and A tandem capping layer, corresponding to both the first tandem organic light-emitting layer and the second tandem organic light-emitting layer in the tandem pixel region; and A common electrode is located between the first capping layer and the first organic light-emitting layer, and between the tandem capping layer and the second tandem organic light-emitting layer. in, Each of the first capping layer and the tandem capping layers has a thickness, and The thickness of the tandem capping layer is less than the thickness of the first capping layer.

2. The display device according to claim 1, wherein, The first capping layer and the tandem capping layers comprise organic materials.

3. The display device according to claim 1, further comprising: A first hole transfer layer is located between the first pixel electrode and the first organic light-emitting layer, and between the tandem pixel electrode and the first tandem organic light-emitting layer. as well as The second hole transfer layer is located in the tandem pixel region, between the first tandem organic light-emitting layer and the second tandem organic light-emitting layer.

4. The display device according to claim 3, further comprising: A first electron transfer layer is located in the tandem pixel region, between the first tandem organic light-emitting layer and the second hole transfer layer; as well as A second electron transfer layer is located between the second tandem organic light-emitting layer and the common electrode, and between the first organic light-emitting layer and the common electrode.

5. The display device according to claim 4, further comprising a charge generation layer between the first electron transfer layer and the second hole transfer layer in the tandem pixel region.

6. The display device according to claim 5, wherein, The second hole transfer layer, the first electron transfer layer, and the charge generation layer in the series pixel region are spaced apart from the first pixel region.

7. The display device according to claim 1, further comprising: The second pixel region is located between the first pixel region and the concatenated pixel region; In the second pixel region, the display device includes: The second pixel electrode is located in the same layer as the first pixel electrode and the tandem pixel electrode; and The second organic light-emitting layer emits light of a third color that is different from the first and second colors; A second capping layer, within which the second organic light-emitting layer corresponds and has a thickness; and The common electrode is also located between the second capping layer and the second organic light-emitting layer.

8. The display device according to claim 7, wherein, The thickness of the first capping layer is the same as the thickness of the second capping layer.

9. The display device according to claim 7, wherein, The thickness of the first capping layer, the thickness of the second capping layer, and the thickness of the tandem capping layers are different from each other.

10. The display device according to claim 7, wherein, The thickness of the first capping layer and the thickness of the second capping layer are both greater than the thickness of the tandem capping layers.

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