Display device

Abstract

A display device comprises a substrate, a driving element, a light-emitting element, and a dam. The substrate includes a display area and a non-display area. The non-display area surrounds the display area. A driving element is placed in the display area. A light-emitting element is placed on the driving element. A dam is placed in the non-display area. The dam surrounds the display area. The dam includes a first organic layer, reflow prevention patterns, and a second organic layer. Reflow prevention patterns are placed on both edges of the first organic layer. The reflow prevention patterns comprise a material different from that of the first organic layer. A second organic layer is placed on the first organic layer. The second organic layer contacts the first organic layer between the reflow prevention patterns. As a result, the adhesion between the first organic layer and the second organic layer is enhanced, and the second organic layer does not flow along the sides of the first organic layer.

Description

Technology Field

[0001] The present invention relates to a display device. More specifically, the present invention relates to an organic light-emitting display device. Background Technology

[0002] Thanks to technological advancements, display devices are being produced that are smaller and lighter while offering superior performance. Until now, conventional cathode ray tube (CRT) televisions have been widely used as display devices due to their many advantages in terms of performance and price. Display devices that overcome the disadvantages of the CRT in terms of miniaturization and portability, and possess advantages such as miniaturization, light weight, and low power consumption, are attracting attention. For example, plasma display devices, liquid crystal display devices, organic light-emitting diode (OLED) display devices, and quantum dot display devices are receiving attention.

[0003] The display device may include a display area for displaying an image and a non-display area surrounding the display area. The area of ​​the non-display area may be dead space of the display device. Therefore, the width of the non-display area needs to be reduced. The problem to be solved

[0004] The objective of the present invention is to provide a display device with a small non-display area.

[0005] However, the purpose of the present invention is not limited to the aforementioned purpose and may be expanded in various ways without departing from the spirit and scope of the present invention. means of solving the problem

[0006] To achieve the aforementioned objectives of the present invention, a display device according to one embodiment of the present invention may include a substrate comprising a display area and a non-display area surrounding the display area, a driving element disposed in the display area, a light-emitting element disposed on the driving element, and a dam disposed in the non-display area and surrounding the display area. The dam may include a first organic layer, first reflow prevention patterns disposed on both edges of the first organic layer and comprising a material different from the first organic layer, and a second organic layer disposed on the first organic layer and in contact with the first organic layer between the first reflow prevention patterns.

[0007] According to one embodiment, the first reflow prevention patterns may include inorganic materials.

[0008] According to one embodiment, the first reflow prevention patterns may include metal.

[0009] According to one embodiment, the dam may further include a first adhesive pattern disposed between the first reflow prevention patterns.

[0010] According to one embodiment, the first reflow prevention patterns and the first adhesive pattern may include the same material.

[0011] According to one embodiment, the first adhesive pattern may have an inverse taper shape.

[0012] According to one embodiment, the display device may further include a source layer disposed between the driving element and the light-emitting element. The source layer and the first reflow prevention patterns may include the same material.

[0013] According to one embodiment, the dam may further include second reflow prevention patterns disposed on both edges of the second organic layer and comprising a material different from the second organic layer, and a third organic layer disposed on the second organic layer and in contact with the second organic layer between the second reflow prevention patterns.

[0014] According to one embodiment, the light-emitting element may include a pixel electrode, a light-emitting layer disposed on the pixel electrode, and a common electrode disposed on the light-emitting layer. The pixel electrode and the second reflow prevention patterns may include the same material.

[0015] According to one embodiment, the dam may further include a second adhesive pattern disposed between the second reflow prevention patterns.

[0016] According to one embodiment, the second reflow prevention patterns and the second adhesive pattern may include the same material.

[0017] According to one embodiment, the second adhesive pattern may have an inverse taper shape.

[0018] According to one embodiment, the angle of inclination of the side of the first organic layer may be smaller than the angle of inclination of the side of the second organic layer.

[0019] According to one embodiment, the second organic layer may not cover the side of the first organic layer.

[0020] According to one embodiment, the width of the second organic layer may be smaller than the width of the first organic layer.

[0021] According to one embodiment, the dam may further include a spacer disposed on the second organic layer.

[0022] To achieve the aforementioned objective of the present invention, a display device according to another embodiment of the present invention may include a substrate comprising a display area and a non-display area surrounding the display area, a driving element disposed in the display area, a light-emitting element disposed on the driving element, a source layer disposed between the driving element and the light-emitting element, and a dam disposed in the non-display area and surrounding the display area. The dam may include a first organic layer, first reflow prevention patterns disposed on both edges of the first organic layer and comprising the same material as the source layer, a first adhesive pattern disposed between the first reflow prevention patterns, and a second organic layer disposed on the first organic layer and in contact with the first organic layer between the first reflow prevention patterns.

[0023] According to one embodiment, the first reflow prevention patterns and the first adhesive pattern may include the same material.

[0024] According to one embodiment, the dam may further include second reflow prevention patterns disposed on both edges of the second organic layer and comprising a material different from the second organic layer, a second adhesive pattern disposed between the second reflow prevention patterns, and a third organic layer disposed on the second organic layer and in contact with the second organic layer between the second reflow prevention patterns.

[0025] According to one embodiment, the second reflow prevention patterns and the second adhesive pattern may include the same material. Effects of the invention

[0026] By placing a reflow prevention pattern on the first organic layer of the dam, the reflow phenomenon in which the second organic layer placed on the first organic layer flows along the side of the first organic layer can be prevented.

[0027] By placing an adhesive pattern on the first organic layer, the adhesion between the first organic layer and the second organic layer can be improved. As a result, the width of the second organic layer may be smaller than the width of the first organic layer. Therefore, the width of the non-display area can be reduced, thereby reducing dead space.

[0028] By having the above adhesive pattern have an inverse taper shape, the adhesive strength between the first organic layer and the second organic layer can be effectively improved.

[0029] By having the side angle of the second organic layer greater than the side angle of the first organic layer, the dam can effectively prevent an overflow phenomenon in which organic materials such as monomers overflow.

[0030] However, the effects of the present invention are not limited to the effects described above, and may be extended in various ways without departing from the spirit and scope of the present invention. Brief explanation of the drawing

[0031] FIG. 1 is a plan view showing a display device according to one embodiment of the present invention. Figure 2 is a cross-sectional view of the display device of Figure 1 cut along line II'. Figures 3 and 4 are plan views showing a part of the dam included in the display device of Figure 2. FIGS. 5a to 5f are cross-sectional views illustrating a method of manufacturing the display device of FIG. 2. Figure 6 is an enlarged view showing an example of a dam included in the display device of Figure 2. Figure 7 is an enlarged view showing another example of a dam included in the display device of Figure 2. FIG. 8 is a cross-sectional view showing a display device according to another embodiment of the present invention. Specific details for implementing the invention

[0032] Hereinafter, embodiments of the present invention will be described in more detail with reference to the attached drawings. Identical components in the drawings will be referred to by the same reference numerals, and redundant descriptions of identical components will be omitted.

[0033] FIG. 1 is a plan view showing a display device (1000) according to one embodiment of the present invention.

[0034] Referring to FIG. 1, a display device (1000) according to one embodiment of the present invention may include a substrate (100). The substrate (100) may include a display area (DA) and a non-display area (NDA). The display area (DA) may display an image. The non-display area (NDA) may surround the display area (DA). The non-display area (NDA) may not display an image. The area of ​​the non-display area (NDA) may be dead space. Therefore, the width (ds) of the non-display area (NDA) needs to be reduced.

[0035] Multiple pixels may be arranged in a display area (DA). For example, the pixels may be arranged in a matrix form along a first direction (DR1) and a second direction (DR2) that intersects the first direction (DR1). The second direction (DR2) may be perpendicular to the first direction (DR1). Each of the pixels may include a driving element and a light-emitting element. The light-emitting element may generate light. For example, the light-emitting element may include an organic light-emitting diode. For another example, the light-emitting element may include a nano light-emitting diode. The driving element may provide various signals and various voltages for the light-emitting element to generate light.

[0036] FIG. 2 is a cross-sectional view of the display device (1000) of FIG. 1 cut along line II'.

[0037] Referring to FIGS. 1 and 2, a display device (1000) may include a substrate (100), a driving element (200), a gate insulating layer (112), an interlayer insulating layer (114), a first organic insulating layer (120), a second organic insulating layer (130), a light-emitting element (400), a pixel defining film (140), an encapsulation layer (500), a first dam (DAM1), and a second dam (DAM2). For example, the driving element (200) may include an active layer (210), a gate electrode (220), a source electrode (232), and a drain electrode (234). For example, the light-emitting element (400) may include a pixel electrode (410), a light-emitting layer (420), and a common electrode (430). For example, the bag layer (500) may include a first inorganic bag layer (510), an organic bag layer (520), and a second inorganic bag layer (530).

[0038] The substrate (100) may be an insulating substrate. For example, the substrate (100) may be a flexible substrate formed of plastic or the like. As a specific example, the substrate (100) may be a polyimide substrate. The polyimide substrate may include a first polyimide layer, a barrier layer, a second polyimide layer, etc. As another example, the substrate (100) may be a glass substrate, a quartz substrate, a calcium fluoride substrate, etc.

[0039] The substrate (100) may include a display area (DA) and a non-display area (NDA). The non-display area (NDA) may include a first area (1A), a first dam area (DMA1), a second area (2A), a second dam area (DMA2), and a third area (3A). The first dam area (DMA1) is located outside the display area (DA) and may be spaced apart from the display area (DA). The second dam area (DMA2) is located outside the first dam area (DMA1) and may be spaced apart from the first dam area (DMA1). The first area (1A) may be located between the display area (DA) and the first dam area (DMA1). The second area (2A) may be located between the first dam area (DMA1) and the second dam area (DMA2). The third area (3A) may be located outside the second dam area (DMA2).

[0040] In the example of FIG. 2, the outer side of the display area (DA) may represent the first direction (DR1). That is, the first dam area (DMA1) may be spaced apart from the display area (DA) in the first direction (DR1), and the second dam area (DMA2) may be spaced apart from the first dam area (DMA1) in the first direction (DR1).

[0041] The active layer (210) may be disposed in a display area (DA) on the substrate (100). For example, the active layer (210) may include a silicon semiconductor, an oxide semiconductor, etc. The silicon semiconductor may include amorphous silicon, polycrystalline silicon, etc.

[0042] Although not illustrated in the drawing, a buffer layer may be disposed between the substrate (100) and the active layer (210). For example, the buffer layer may be disposed entirely over the display area (DA) and non-display area (NDA) on the substrate (100). That is, the active layer (210) may be disposed over the display area (DA) on the buffer layer. The buffer layer may prevent impurities from the substrate (100) from diffusing into the active layer (210). For example, the buffer layer may include an inorganic insulating material. An example of the inorganic insulating material is silicon oxide (SiO₂). x ), silicon nitride (SiN x ), titanium oxide (TiO x ), tantalum oxide (TaO x ...can be cited.

[0043] A gate insulating layer (112) may be disposed on a substrate (100). For example, the gate insulating layer (112) may be disposed entirely over a display area (DA) and a non-display area (NDA) on the substrate (100). The gate insulating layer (112) disposed over the display area (DA) may cover an active layer (210). For example, the gate insulating layer (112) may include an inorganic insulating material.

[0044] The gate electrode (220) may be placed in a display area (DA) on the gate insulating layer (112). The gate electrode (220) may be superimposed on the active layer (210). The gate electrode (220) may include a metal, a metal oxide, etc. Examples of the metal include silver, molybdenum, aluminum, tungsten, copper, nickel, chromium, titanium, tantalum, platinum, scandium, etc. Examples of the metal oxide include indium tin oxide, indium zinc oxide, etc.

[0045] An interlayer insulating layer (114) may be disposed on a gate insulating layer (112). For example, the interlayer insulating layer (114) may be disposed entirely over a display area (DA) and a non-display area (NDA) on the gate insulating layer (112). The interlayer insulating layer (114) disposed over the display area (DA) may cover a gate electrode (220) on the gate insulating layer (112). For example, the interlayer insulating layer (114) may include an inorganic insulating material.

[0046] The above buffer layer, gate insulating layer (112), and interlayer insulating layer (114) may be referred to as an inorganic insulating layer (110). The inorganic insulating layer (110) may be disposed entirely in the display area (DA) and non-display area (NDA) between the substrate (100) and the first organic insulating layer (120).

[0047] The source electrode (232) and the drain electrode (234) may be placed in the display area (DA) on the interlayer insulating layer (114). The source electrode (232) and the drain electrode (234) may be connected to the active layer (210). The source electrode (232) and the drain electrode (234) may include a metal, a metal oxide, etc.

[0048] The low power wiring (236) and the high power wiring (238) may be placed in a display area (DA) on the interlayer insulation layer (114). The low power wiring (236) and the high power wiring (238) may be connected to at least one of the plurality of pixels placed in the display area (DA). The low power wiring (236) and the high power wiring (238) may provide voltages to at least one of the pixels for the pixel to generate light.

[0049] The active layer (210), gate electrode (220), source electrode (232), and drain electrode (234) can form a driving element (200). That is, the driving element (200) can be placed in a display area (DA) on the substrate (100).

[0050] The first organic insulating layer (120) can be placed in a display area (DA) on the interlayer insulating layer (114) and can cover the driving element (200). The upper surface of the first organic insulating layer (120) can be substantially flat. Examples of organic insulating materials included in the first organic insulating layer (120) include photoresist, polyacrylic resin, polyimide resin, polyamide resin, silotic resin, acrylic resin, epoxy resin, etc.

[0051] The source layer (300) may include a first connecting electrode (310) and a second connecting electrode (320). The source layer (300) may be disposed on the first organic insulating layer (120). The first connecting electrode (310) may be disposed in a display area (DA). The second connecting electrode (320) may be disposed in a display area (DA) and may extend from the display area (DA) to a non-display area (NDA). However, not limited thereto, the second connecting electrode (320) may be disposed only in the display area (DA).

[0052] The second organic insulating layer (130) may be placed in the display area (DA) on the first organic insulating layer (120) and may cover the source layer (300). The upper surface of the second organic insulating layer (130) may be substantially flat. Examples of organic insulating materials included in the second organic insulating layer (130) include photoresist, polyacrylic resin, polyimide resin, polyamide resin, silotic acid resin, acrylic resin, epoxy resin, etc.

[0053] The pixel electrode (410) may be placed in a display area (DA) on the second organic insulating layer (130). The pixel electrode (410) may be placed on a flat upper surface of the second organic insulating layer (130). The pixel electrode (410) may be connected to a source electrode (232) or a drain electrode (234). That is, the pixel electrode (410) may be placed on a driving element (200) and connected to the driving element (200). The pixel electrode (410) may include a metal, a transparent conductive material, etc.

[0054] A pixel defining film (140) may be placed in a display area (DA) on the second organic insulating layer (130). The pixel defining film (140) may partially cover the pixel electrode (410) on the second organic insulating layer (130). That is, the pixel defining film (140) may have a pixel opening that exposes at least a portion of the pixel electrode (410). The pixel defining film (140) may include an organic insulating material. Examples of the organic insulating material include photoresist, polyacrylic resin, polyimide resin, polyamide resin, silosan resin, acrylic resin, epoxy resin, etc.

[0055] The light-emitting layer (420) may be disposed on the pixel electrode (410) exposed by the pixel opening. The light-emitting layer (420) may be disposed within the pixel opening. The light-emitting layer (420) may be disposed between the pixel electrode (410) and the common electrode (430). Examples of materials included in the light-emitting layer (420) include organic light-emitting materials and quantum dots.

[0056] The common electrode (430) may be placed on the light-emitting layer (420) and may overlap with the pixel electrode (410). For example, the common electrode (430) may be placed entirely on the pixel defining film (140). For example, unlike what is shown in the drawing, the common electrode (430) may be placed entirely on the display area (DA) and the non-display area (NDA). The common electrode (430) may include a transparent conductive material.

[0057] The pixel electrode (410), the light-emitting layer (420), and the common electrode (430) can form a light-emitting element (400). That is, the light-emitting element (400) can be placed in a display area (DA) on the driving element (200).

[0058] The dam (DAM) may include a first dam (DAM1) and a second dam (DAM2). The dam (DAM) may be placed in a non-display area (NDA) on the substrate (100). In one embodiment, the dam (DAM) may be placed in the non-display area (NDA) to surround the display area (DA). The dam (DAM) may prevent the organic material from overflowing toward the edge direction of the substrate (100) (e.g., the first direction (DR1) in FIG. 2) when forming an organic encapsulation layer (520) using an organic material such as a monomer.

[0059] For example, the first dam (DAM1) can be placed in the first dam area (DMA1) on the interlayer insulation layer (114).

[0060] For example, the second dam (DAM2) may be placed in the second dam region (DMA2) on the interlayer insulation layer (114). The second dam (DAM2) may be located outside the first dam (DAM1) and may be spaced apart from the first dam (DAM1) in a first direction (DR1).

[0061] In one embodiment, the dam (DAM) may have a multilayer structure in which a plurality of layers are stacked. Each of the first dam (DAM1) and the second dam (DAM2) may include a first organic layer (710, 910), a second organic layer (720, 920), a third organic layer (730, 930), and a spacer (740, 940). For example, the first organic layers (710, 910) may be formed substantially simultaneously with the first organic insulating layer (120) and may include a material substantially identical to the first organic insulating layer (120). The second organic layers (720, 920) may be formed substantially simultaneously with the second organic insulating layer (130) and may include a material substantially identical to the second organic insulating layer (130). The third organic layers (730, 740) can be formed substantially simultaneously with the pixel defining film (140) and may contain substantially the same material as the pixel defining film (140). The spacers (740, 940) can be formed substantially simultaneously with the third organic insulating layers (730, 930) using a halftone mask and may contain substantially the same material. The spacers (740, 940) may serve to maintain a separation distance between the mask and the substrate (100) when forming the light-emitting layer (420).

[0062] The encapsulation layer (500) can be placed on the light-emitting element (400) to cover the light-emitting element (400). The encapsulation layer (500) can encapsulate the display area (DA) to protect the light-emitting element (400) from external impurities.

[0063] The first inorganic encapsulation layer (510) may be disposed on the common electrode (430). For example, the first inorganic encapsulation layer (510) may have a substantially uniform thickness along the profile of the common electrode (430). The first inorganic encapsulation layer (510) may be disposed entirely over the display area (DA) and the non-display area (NDA).

[0064] The organic encapsulation layer (520) can be disposed on the first inorganic encapsulation layer (510) and can cover the display area (DA). The organic encapsulation layer (520) can have a substantially flat upper surface without creating a step around the first inorganic encapsulation layer (510).

[0065] The organic encapsulation layer (520) can be formed by an inkjet process using an organic material such as a transparent monomer. By the inkjet process, an overflow phenomenon may occur in which the organic material overflows the display area (NDA). A dam (DAM) may be placed in the non-display area (NDA) to prevent the overflow phenomenon from occurring excessively. For example, a first dam (DAM1) can prevent the overflow phenomenon from occurring outside the first area (1A). A second dam (DAM2) can prevent the overflow phenomenon from occurring outside the second area (2A). However, the width (ds) of the non-display area (NDA) may increase due to the first dam (DAM1) and the second dam (DAM2), thereby increasing the dead space. Therefore, the width (ds) of the non-display area (NDA) needs to be reduced.

[0066] Meanwhile, according to a conventional comparative example display device, the first organic layer, the second organic layer, and the third organic layer of the dam may have flowing properties because they contain organic insulating materials. For example, when forming the second organic layer, a reflow phenomenon may occur in which the second organic layer flows along the side of the first organic layer on the first organic layer. That is, the second organic layer can cover the side of the first organic layer. As a result, the width of the dam may increase. That is, as the area where the dam is placed increases, the width of the non-display area may increase. Therefore, it has been necessary to reduce dead space.

[0067] A dam (DAM) included in a display device (1000) according to one embodiment of the present invention may include first reflow prevention patterns (712, 912). Since the first dam (DAM1) and the second dam (DAM2) include substantially the same components, redundant descriptions will be omitted and the first dam (DAM1) will be described in detail.

[0068] FIGS. 3 and FIGS. 4 are plan views showing a part of a dam (DAM) included in the display device (1000) of FIGS. 2. For example, FIGS. 3 and FIGS. 4 may show a first dam (DAM1). Specifically, FIGS. 3 may show a first organic layer (710) of the first dam (DAM1), and FIGS. 4 may show a second organic layer (720) of the first dam (DAM1).

[0069] Referring to FIGS. 2 and 3, the first dam (DAM1) may include a first organic layer (710), first reflow prevention patterns (712), and a first adhesive pattern (714). The second dam (DAM2) may include a first organic layer (910), first reflow prevention patterns (912), and a first adhesive pattern (914).

[0070] The first organic layer (710) may have an upper surface (US1), a side surface (SS1), and a lower surface (LS1). The area of ​​the upper surface (US1) of the first organic layer (710) may be smaller than the area of ​​the lower surface (LS1) of the first organic layer (710). The upper surface (US1) of the first organic layer (710) may have a central region (CA1) and an edge region (EA1).

[0071] The first reflow prevention patterns (712) may be disposed on the first organic layer (710). The first reflow prevention patterns (712) may be disposed on both edges of the first organic layer (710). That is, the first reflow prevention patterns (712) may be disposed on the edge region (EA1). The first reflow prevention patterns (712) may include a material different from the first organic layer (710). In one embodiment, the first reflow prevention patterns (712) may include a metal. The first reflow prevention patterns (712) may include the same material as the source layer (300). In another embodiment, the first reflow prevention patterns (712) may include an inorganic material.

[0072] The first reflow prevention patterns (712) can prevent the reflow phenomenon in which the second organic layer (720) flows along the side (SS1) of the first organic layer (710) when the second organic layer (720) is formed. Accordingly, the second organic layer (720) can be placed on the upper surface (US1) of the first organic layer (710). The second organic layer (720) may not cover the side (SS1) of the first organic layer (710). The width of the second organic layer (720) may be smaller than the width of the first organic layer (710).

[0073] The first adhesive pattern (714) may be placed on the first organic layer (710). The first adhesive pattern (714) may be placed in the center of the first organic layer (710). The first adhesive pattern (714) may be placed in the central region (CA1). That is, the first adhesive pattern (714) may be placed between the first reflow prevention patterns (712). The first adhesive pattern (714) may include a material different from the first organic layer (710). In one embodiment, the first adhesive pattern (714) may include a metal. In another embodiment, the first adhesive pattern (714) may include an inorganic material. That is, the first adhesive pattern (714) and the first reflow prevention patterns (712) may include the same material.

[0074] In one embodiment, the first adhesive pattern (714) may be formed substantially simultaneously with the first reflow prevention patterns (712) and may include a material substantially identical to the first reflow prevention patterns (712).

[0075] The first adhesive pattern (714) is illustrated as being provided in multiple numbers, but is not limited thereto. The first adhesive pattern (714) may be provided as a single unit.

[0076] The first adhesive pattern (714) may be spaced apart from each of the first reflow patterns (712). Accordingly, the second organic layer (720) may come into contact with the first organic layer (710) between the first adhesive pattern (714) and each of the first reflow patterns (712). When the first adhesive pattern (714) is provided in multiple numbers, the second organic layer (720) may come into contact with the first organic layer (710) between the first adhesive patterns (714).

[0077] The first adhesive pattern (714) can improve the adhesive strength between the first organic layer (710) and the second organic layer (720). Specifically, the adhesive strength may be small when the second organic layer (720) is placed on the first organic layer (710) having a flat upper surface. By the first adhesive pattern (714), the adhesive strength between the first organic layer (710) and the second organic layer (720) can be improved.

[0078] The first reflow prevention patterns (712) can not only prevent the reflow phenomenon but also improve the adhesion between the first organic layer (710) and the second organic layer (720).

[0079] Referring to FIGS. 2 to 4, the first dam (DAM1) may include a second organic layer (720), second reflow prevention patterns (722), and a second adhesive pattern (724).

[0080] The second organic layer (720) may have an upper surface (US2), a side surface (SS2), and a lower surface (LS2). The area of ​​the upper surface (US2) of the second organic layer (720) may be smaller than the area of ​​the lower surface (LS2) of the second organic layer (720). The upper surface (US2) of the second organic layer (720) may have a central region (CA2) and an edge region (EA2).

[0081] The second organic layer (720) may not experience the reflow phenomenon due to the first reflow prevention patterns (712). Accordingly, the area of ​​the lower surface (LS2) of the second organic layer (720) may be the same as the area of ​​the upper surface (US1) of the first organic layer (710). That is, the second organic layer (720) may not cover the side surface (SS1) of the first organic layer (710), and the width of the second organic layer (720) may be smaller than the width of the first organic layer (710).

[0082] The second reflow prevention patterns (722) may be placed on both edges of the second organic layer (720). That is, the second reflow prevention patterns (722) may be placed in the edge region (EA2) of the second organic layer (720). The second reflow prevention patterns (722) may include a material different from that of the second organic layer (720). In one embodiment, the second reflow prevention patterns (722) may include a metal. The second reflow prevention patterns (722) may include the same material as the lower electrode (410). In another embodiment, the second reflow prevention patterns (722) may include an inorganic material.

[0083] The second reflow prevention patterns (722) can prevent the reflow phenomenon in which the third organic layer (730) flows along the side (SS2) of the second organic layer (720). Accordingly, the third organic layer (730) can be placed on the upper surface (US2) of the second organic layer (720). The third organic layer (730) may not cover the side (SS2) of the second organic layer (720). The width of the third organic layer (730) may be smaller than the width of the second organic layer (720).

[0084] The second adhesive pattern (724) may be placed between the second reflow prevention patterns (722). The second adhesive pattern (724) may be formed substantially simultaneously with the second reflow prevention patterns (722) and may include a material substantially identical to that of the second reflow prevention patterns (722).

[0085] The second adhesive pattern (724) can improve the adhesion between the second organic layer (720) and the third organic layer (730). The second reflow prevention patterns (722) can not only prevent the reflow phenomenon but also improve the adhesion between the second organic layer (720) and the third organic layer (730).

[0086] FIGS. 5a to 5f are cross-sectional views illustrating a method of manufacturing the display device (1000) of FIG. 2.

[0087] Referring to FIG. 5a, the method of manufacturing a display device (1000) may include the step of forming a driving element (200) on a substrate (100).

[0088] When the source electrode (232) and drain electrode (234) of the driving element (200) are formed, the low power wiring (236) and high power wiring (238) may be formed simultaneously. The source electrode (232), drain electrode (234), low power wiring (236), and high power wiring (238) may contain the same material.

[0089] A first organic insulating layer (120) and first organic layers (710, 910) can be formed on a driving element (200). The first organic insulating layer (120) and the first organic layers (710, 910) can be formed substantially simultaneously and may include substantially the same material.

[0090] Referring to FIG. 5b, a source layer (300) can be formed entirely on the first organic insulating layer (120) and the first organic layers (710, 910) in the display area (DA) and non-display area (NDA).

[0091] Referring to FIG. 5c, the source layer (300) can be patterned to form a first connecting electrode (310), a second connecting electrode (320), first reflow prevention patterns (712, 912), and a first adhesive pattern (714, 914). The first connecting electrode (310), the second connecting electrode (320), the first reflow prevention patterns (712, 912), and the first adhesive pattern (714, 914) can be formed substantially simultaneously and may comprise substantially the same material. The source layer (300) can be patterned so that the second connecting electrode (320) extends from the display area (DA) to the non-display area (NDA) and is connected to the first reflow patterns (712). However, it is not limited thereto.

[0092] Referring to FIG. 5d, a second organic insulating layer (130) and second organic layers (720, 920) can be formed on a first connecting electrode (310), a second connecting electrode (320), first reflow prevention patterns (712, 912), and a first adhesive pattern (714, 914). The second organic insulating layer (130) and the second organic layers (720, 920) can be formed substantially simultaneously and may comprise substantially the same material.

[0093] An anode layer (415) can be formed entirely on the second organic insulating layer (130) and the second organic layers (720, 920) in the display area (DA) and non-display area (NDA).

[0094] Referring to FIG. 5e, the anode layer (415) can be patterned to form a pixel electrode (410), a third connecting electrode (412), second reflow prevention patterns (722, 922), and a second adhesive pattern (724, 924). The pixel electrode (410), the third connecting electrode (412), the second reflow prevention patterns (722, 922), and the second adhesive pattern (724, 924) can be formed substantially simultaneously and may comprise substantially the same material. The anode layer (415) can be patterned so that the third connecting electrode (412) extends from the display area (DA) to the non-display area (NDA) and is connected to the second reflow prevention patterns (722). However, it is not limited thereto.

[0095] Referring to FIG. 5f, a pixel defining film (140) and third organic layers (730, 930) can be formed on a pixel electrode (410), a third connecting electrode (412), second reflow prevention patterns (722, 922), and a second adhesive pattern (724, 924). The pixel defining film (140) and the third organic layers (730, 930) can be formed substantially simultaneously and may comprise substantially the same material. Spacers (740, 940) can be formed on the third organic layers (730, 930). When the spacers (740, 940) are formed using a halftone mask, the pixel defining film (140), the third organic layers (730, 930), and the spacers (740, 940) can be formed substantially simultaneously.

[0096] A light-emitting layer (420) and a common electrode (430) can be sequentially formed on a pixel definition film (140).

[0097] A first inorganic encapsulation layer (510) can be formed entirely on the common electrode (430) and spacers (740, 940) in the display area (DA) and non-display area (NDA).

[0098] An organic encapsulation layer (520) can be formed on a display area (DA) on the first inorganic encapsulation layer (510). In this case, the overflow phenomenon may occur, causing the organic encapsulation layer (520) to overflow the display area (DA) and be formed on a part of the non-display area (NDA). A dam (DAM) can prevent the organic encapsulation layer (520) from overflowing excessively along the first direction (DR1).

[0099] A second inorganic encapsulation layer (530) can be formed on the organic encapsulation layer (520) in the entire display area (DA) and non-display area (NDA).

[0100] FIG. 6 is an enlarged view showing an example of a dam (DAM) included in the display device (1000) of FIG. 2. For example, FIG. 6 may show a case where the first dam (DAM1) prevents the overflow phenomenon as shown in FIG. 2. That is, FIG. 6 may show an example of the first dam (DAM1), but the second dam (DAM2) may also have the same structure as the first dam (DAM1).

[0101] Referring to FIG. 6, the first dam (DAM1) can prevent an organic encapsulation layer (520) containing organic materials such as monomers from overflowing in the first direction (DR1). A first virtual plane (VS1) extending from the side of the spacer (740) and a second virtual plane (VS2) in contact with the organic encapsulation layer (520) can define an overflow angle (θ-5).

[0102] The side of the first organic layer (710) may have a predetermined angle of inclination (θ1).

[0103] Since the first reflow prevention patterns (712) and the first adhesive pattern (714) are disposed on the first organic layer (710), the angle of inclination (θ2) of the side of the second organic layer (720) may be greater than the angle of inclination (θ1) of the side of the first organic layer (710). Since the second reflow prevention patterns (722) and the second adhesive pattern (724) are disposed on the second organic layer (720), the angle of inclination (θ3) of the side of the third organic layer (730) may be greater than the angle of inclination (θ2) of the side of the second organic layer (720).

[0104] Accordingly, the angle of inclination (θ4) of the side of the spacer (740) may be greater than the angle of inclination (θ1) of the side of the first organic layer (710). For example, the angle of inclination (θ4) of the side of the spacer (740) may be approximately 90 degrees. As a result, the overflow angle (θ5) may increase. That is, the first dam (DAM1) can effectively prevent the overflow phenomenon.

[0105] FIG. 7 is an enlarged view showing another example of a dam (DAM) included in the display device (1000) of FIG. 2. The same reference numerals are used for components identical to those in FIG. 6, and redundant descriptions of identical components are omitted.

[0106] Referring to FIG. 7, the first adhesive pattern (714) may have an inverse taper shape. The second adhesive pattern (724) may have an inverse taper shape.

[0107] The first adhesive pattern (714) having the above-mentioned inverse taper shape can effectively improve the adhesive strength between the first organic layer (710) and the second organic layer (720). The second adhesive pattern (724) having the above-mentioned inverse taper shape can effectively improve the adhesive strength between the second organic layer (720) and the third organic layer (730).

[0108] Since the first reflow prevention patterns (712) and the second reflow prevention patterns (722) can also perform the role of improving adhesion, each of the first reflow prevention patterns (712) and the second reflow prevention patterns (722) may have an inverse taper shape.

[0109] FIG. 8 is a cross-sectional view showing a display device (1100) according to another embodiment of the present invention. The same reference numerals are used for components identical to those in FIG. 2, and redundant descriptions of identical components are omitted.

[0110] Referring to FIG. 8, the first reflow prevention patterns (612, 812), first adhesive patterns (614, 814), second reflow prevention patterns (622, 822), and second adhesive patterns (624, 824) included in the display device (1100) according to another embodiment of the present invention may include inorganic materials. In this case, the first reflow prevention patterns (612) may not be connected to the second connecting electrode (320), and the second reflow prevention patterns (622) may not be connected to the third connecting electrode (412). Industrial applicability

[0111] The present invention may be applied to display devices and electronic devices including the same. For example, the present invention may be applied to high-resolution smartphones, mobile phones, smartpads, smartwatches, tablet PCs, vehicle navigation systems, televisions, computer monitors, laptops, etc.

[0112] Although the present invention has been described above with reference to exemplary embodiments, those skilled in the art will understand that various modifications and changes can be made to the invention without departing from the spirit and scope of the invention as set forth in the following claims. Explanation of the symbols

[0113] 1000, 1100: Display device 100: Substrate DA: Display area NDA: Non-display area 200: Driving element 400: Light-emitting element DAM: Dam 710, 910: 1st Organic Layer 712, 912: 1st reflow prevention patterns 722, 922: Second reflow prevention patterns 720, 920: 2nd organic layer 730, 930: 3rd organic layer 714, 914: 1st adhesive pattern 724, 924: 2nd adhesive pattern 300: Source layer 410: Pixel electrode 420: Emitting layer 430: Common electrode θ1: Angle of inclination of the side of the first organic layer θ2: Angle of inclination of the side of the second organic layer 740, 940: Spacers

Claims

Claim 1 A display device comprising: a substrate including a display area and a non-display area surrounding the display area; a driving element disposed in the display area; a light-emitting element disposed on the driving element; and a dam disposed in the non-display area and surrounding the display area, wherein the dam comprises: a first organic layer; first reflow prevention patterns disposed on both edges of the first organic layer and having a material different from the first organic layer; a second organic layer disposed on the first organic layer and in contact with the first organic layer between the first reflow prevention patterns; second reflow prevention patterns disposed on both edges of the second organic layer and having a material different from the second organic layer; and a third organic layer disposed on the second organic layer and in contact with the second organic layer between the second reflow prevention patterns, wherein at least some of the second reflow prevention patterns are spaced apart from at least some of the first reflow prevention patterns. Claim 2 A display device according to claim 1, wherein the first reflow prevention patterns comprise inorganic materials. Claim 3 A display device according to claim 1, wherein the first reflow prevention patterns comprise metal. Claim 4 A display device according to claim 1, wherein the dam further comprises a first adhesive pattern disposed between the first reflow prevention patterns. Claim 5 A display device according to claim 4, wherein the first reflow prevention patterns and the first adhesive pattern comprise the same material. Claim 6 A display device according to claim 4, characterized in that the first adhesive pattern has an inverted tapered shape. Claim 7 A display device according to claim 1, further comprising a source layer disposed between the driving element and the light-emitting element, wherein the source layer and the first reflow prevention patterns comprise the same material. Claim 8 delete Claim 9 A display device according to claim 1, wherein the light-emitting element comprises: a pixel electrode; a light-emitting layer disposed on the pixel electrode; and a common electrode disposed on the light-emitting layer, and wherein the pixel electrode and the second reflow prevention patterns comprise the same material. Claim 10 A display device according to claim 1, wherein the dam further comprises a second adhesive pattern disposed between the second reflow prevention patterns. Claim 11 A display device according to claim 10, characterized in that the second reflow prevention patterns and the second adhesive pattern comprise the same material. Claim 12 A display device according to claim 10, wherein the second adhesive pattern has an inverse tapered shape. Claim 13 A display device according to claim 1, characterized in that the angle of inclination of the side of the first organic layer is smaller than the angle of inclination of the side of the second organic layer. Claim 14 A display device according to claim 1, characterized in that the second organic layer does not cover the side of the first organic layer. Claim 15 A display device according to claim 1, characterized in that the width of the second organic layer is smaller than the width of the first organic layer. Claim 16 A display device according to claim 1, wherein the dam further comprises a spacer disposed on the second organic layer. Claim 17 A substrate comprising a display area and a non-display area surrounding the display area; a driving element disposed in the display area; a light-emitting element disposed on the driving element; a source layer disposed between the driving element and the light-emitting element; and a dam disposed in the non-display area and surrounding the display area, wherein the dam comprises: a first organic layer; first reflow prevention patterns disposed on both edges of the first organic layer and comprising a material identical to that of the source layer; a first adhesive pattern disposed between the first reflow prevention patterns; a second organic layer disposed on the first organic layer and in contact with the first organic layer between the first reflow prevention patterns; and second reflow prevention patterns disposed on both edges of the second organic layer and comprising a material different from that of the second organic layer. A display device comprising a third organic layer disposed on the second organic layer and in contact with the second organic layer between the second reflow prevention patterns, wherein at least some of the second reflow prevention patterns are spaced apart from at least some of the first reflow prevention patterns. Claim 18 A display device according to claim 17, wherein the first reflow prevention patterns and the first adhesive pattern comprise the same material. Claim 19 A display device according to claim 17, wherein the dam further comprises a second adhesive pattern disposed between the second reflow prevention patterns. Claim 20 A display device according to claim 19, wherein the second reflow prevention patterns and the second adhesive pattern comprise the same material.

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