KR102338622B1 - Display device and method of manufacturing a display device - Google Patents

Abstract

The display device includes a first substrate having a display area and a peripheral area, display structures disposed on the display area, and a second light scattering structure facing the first substrate and disposed in the display area to scatter light generated from the display structure. and a light blocking member disposed adjacent to the substrate and the light scattering structure. Since the display device has a light scattering structure, a color shift shape of light emitted from the display structure may be prevented, thereby improving image quality.

Description

A display device and a manufacturing method of the display device

The present invention relates to a display device and a method of manufacturing the display device. More particularly, the present invention relates to a display device including a light scattering structure and a method of manufacturing such a display device.

In a conventional organic light emitting diode display having a resonance structure, lights generated from the organic light emitting layer may overlap, and the overlapped light has strong straightness. When light has a strong linearity in the organic light emitting display device, a color shift phenomenon of an image displayed by the organic light emitting display device may occur. For example, when a user views the organic light emitting diode display from the side, a color shift of an image occurs and the quality thereof is deteriorated.

In order to improve the color shift of an image, a conventional display device additionally includes a polarizing plate, a prism sheet, and the like. For example, the prism sheet may improve color shift by scattering light generated from the organic emission layer. However, when the display device additionally includes a polarizing plate, a prism sheet, or the like, there are problems in that the weight and size of the display device increase as well as increase in manufacturing cost. Accordingly, there is a need for a display device capable of effectively scattering light generated from an organic light emitting layer to improve image quality without including additional elements such as a polarizing plate and a prism sheet.

SUMMARY OF THE INVENTION One object of the present invention is to provide a display device having a light scattering structure to improve image quality.

Another object of the present invention is to provide a method of manufacturing a display device capable of scattering light.

However, the object of the present invention is not limited to the above objects, and may be expanded in various ways without departing from the spirit and scope of the present invention.

In order to achieve one aspect of the present invention, a display device according to an embodiment of the present invention includes a first substrate having a display area and a peripheral area, display structures disposed in the display area, and facing the first substrate, a second substrate positioned in the display area and having a light scattering structure for scattering light generated from the display structure; and a light blocking member disposed adjacent to the light scattering structure.

According to an embodiment, the light scattering structure may include at least one recess.

According to an embodiment, the recess may have a rounded bottom surface.

According to an embodiment, the light scattering structure may further include a transparent member buried in the recess.

According to an embodiment, the transparent member may have a refractive index different from that of the second substrate.

According to an embodiment, the transparent member may include a polyimide-based resin, a photoresist, an acrylic resin, a polyamide-based resin, or a siloxane-based resin.

According to an embodiment, the light scattering structure may further include a plurality of recesses.

According to an embodiment, the light scattering structure may further include a plurality of transparent members respectively buried in the plurality of recesses.

According to an embodiment, the light scattering structure may include at least one protrusion.

According to an embodiment, the protrusion may have a rounded upper surface.

According to an embodiment, the light scattering structure may include a plurality of protrusions.

According to an embodiment, the second substrate may include a plurality of organic layers and a plurality of inorganic layers that are alternately disposed.

According to an embodiment, the light scattering structure may include at least one recess formed in an uppermost inorganic layer and an uppermost organic layer.

According to an embodiment, the light scattering structure may include at least one protrusion disposed on the uppermost inorganic layer.

In order to achieve another object of the present invention, a method of manufacturing a display device according to an embodiment of the present invention includes the steps of: forming a first substrate having a display area and a peripheral area; forming a display structure in the display area; The method may include forming a second substrate on a display structure, forming a light scattering structure in a display area of the second substrate, and forming a light blocking member adjacent to the light scattering structure in the peripheral area.

According to an embodiment, the forming of the light scattering structure may include forming at least one recess by partially etching the second substrate of the display area.

According to an embodiment, the forming of the light scattering structure may further include forming at least one transparent member filling the at least one recess.

According to an embodiment, the forming of the light scattering structure may include forming at least one protrusion on the second substrate of the display area by partially etching the second substrate in the peripheral area. .

In example embodiments, forming the second substrate may include alternately stacking a plurality of organic layers and a plurality of inorganic layers on the display structure.

According to an embodiment, the forming of the light scattering structure may include forming at least one recess in the uppermost inorganic layer and the uppermost organic layer or forming at least one protrusion on the uppermost inorganic layer. may include

A display device according to example embodiments may include a light scattering structure including at least one recess and at least one protrusion while having a light resonance configuration. Accordingly, it is possible to effectively scatter light generated from the light emitting layer of the display structure to reduce or prevent a color shift, so that the quality of an image displayed by the display device can be improved.

However, the effects of the present invention are not limited to the above-described effects, and may be variously expanded without departing from the spirit and scope of the present invention.

1 is a cross-sectional view illustrating a display device according to exemplary embodiments of the present invention.
2A to 2E are cross-sectional views illustrating a method of manufacturing a display device according to exemplary embodiments of the present invention.
3 is a cross-sectional view illustrating a display device according to other exemplary embodiments of the present invention.
4 is a cross-sectional view illustrating a display device according to still another exemplary embodiment of the present invention.
5 is a cross-sectional view illustrating a display device according to still another exemplary embodiment of the present invention.
6 is a cross-sectional view illustrating a display device according to still another exemplary embodiment of the present invention.
7 is a cross-sectional view illustrating a display device according to still another exemplary embodiment of the present invention.
8 is a cross-sectional view illustrating a display device according to still another exemplary embodiment of the present invention.
9 is a cross-sectional view illustrating a display device according to still another exemplary embodiment of the present invention.
10 is a cross-sectional view illustrating a display device according to still another exemplary embodiment of the present invention.
11 is a cross-sectional view illustrating a display device according to still another exemplary embodiment of the present invention.
12 is a cross-sectional view illustrating a display device according to still another exemplary embodiment of the present invention.
13 is a cross-sectional view illustrating a display device according to still another exemplary embodiment of the present invention.

In the exemplary embodiments of the present invention disclosed in the text, specific structural and functional descriptions are only exemplified for the purpose of describing exemplary embodiments of the present invention, and the embodiments of the present invention are modified in various forms. and may be changed, and is not limited to the exemplary embodiments described herein.

Although the present invention is capable of various modifications and variations and may be embodied in various forms, specific embodiments are illustrated in the drawings and described in detail herein. However, this is not intended to limit the present invention to the specific disclosed forms, it should be understood to include all modifications, equivalents and substitutes included in the spirit and scope of the present invention.

Terms such as 1st, 2nd, etc. may be used to describe various components, but the components are not limited by these terms. The above terms may be used for the purpose of distinguishing one component from other components. For example, without departing from the scope of the present invention, a first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component.

When a component is referred to as being “connected” or “connected” to another component, it is understood that it may be directly connected or connected to the other component, but other components may exist in between. it should be On the other hand, when it is said that a certain element is "directly connected" or "directly connected" to another element, it should be understood that no other element is present in the middle. Other expressions describing the relationship between elements, such as "between" and "immediately between" or "adjacent to" and "directly adjacent to", etc., should be interpreted similarly.

The terminology used in this application is used only to describe exemplary embodiments, and is not intended to limit the present invention. The singular expression includes the plural expression unless the context clearly dictates otherwise. In the present application, terms such as "comprise" or "have" are intended to designate that the described feature, number, step, operation, component, part, or combination thereof exists, and is one or more other features or numbers , it is to be understood that the existence or addition of steps, operations, components, parts or combinations thereof is not precluded in advance.

Unless defined otherwise, all terms used herein, including technical and scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries should be interpreted as meanings consistent with the context of the related art, and unless explicitly defined in the present application, they are not to be interpreted in an ideal or excessively formal meaning. .

Hereinafter, exemplary embodiments of the present invention will be described in more detail with reference to the accompanying drawings. The same or similar reference numerals are used for the same components in the drawings.

1 is a cross-sectional view illustrating a display device according to exemplary embodiments of the present invention. For example, FIG. 1 illustrates a display device including at least one recess as a light scattering structure.

Referring to FIG. 1 , the display device 100 may include a first substrate 110 , a display structure, a second substrate 290 having a light scattering structure 295 , a light blocking member 310 , and the like. In the display device 100 illustrated in FIG. 1 , the display structure includes a switching element 150 , a first electrode 190 , a light emitting layer 210 , a pixel defining layer 230 , a second electrode 250 , and the like. may include

The display device 100 may include a display area I (eg, an active area) and a peripheral area II. Here, the peripheral region II may substantially surround the display region I.

The first substrate 110 may be made of a transparent inorganic material or flexible plastic. For example, the first substrate 110 may include a glass substrate, a quartz substrate, a transparent resin substrate, or the like.

The insulating layer 130 may be disposed on the first substrate 110 . The insulating layer 130 may be made of an inorganic material. For example, the insulating layer 130 may be formed of a silicon compound such as silicon oxide (SiOx), silicon nitride (SiNx), silicon oxynitride (SiOxNy), silicon oxycarbide (SiOxCy), or silicon carbonitride (SiCxNy). . In other exemplary embodiments, the insulating layer 130 may be made of an organic material. For example, the insulating layer 130 may include a polyimide-based resin, a photoresist, an acrylic resin, a polyamide-based resin, a siloxane-based resin, and the like. have. These may be used alone or in combination with each other.

The switching element 150 may be disposed on the insulating layer 130 . For example, the switching device 150 may correspond to a transistor including a gate electrode, a gate insulating layer, an active layer, an etch stop layer, a source electrode, a drain electrode, and the like. According to other exemplary embodiments, the switching device 150 may correspond to an oxide semiconductor device including an active layer made of an oxide semiconductor. The switching element 150 may be electrically connected to the first electrode 190 .

The interlayer insulating layer 170 may be made of silicon oxide, metal oxide, or the like. For example, the interlayer insulating layer 170 may include silicon oxide, silicon nitride, silicon oxynitride, silicon oxycarbide, silicon carbonitride, hafnium oxide (HfOx), aluminum oxide (AlOx), zirconium oxide (ZrOx), titanium oxide ( TiOx), tantalum oxide (TaOx), or the like. These may be used alone or in combination with each other. The interlayer insulating layer 170 may electrically insulate the switching element 150 from the first electrode 190 .

The first electrode 190 may be disposed on the interlayer insulating layer 170 . The first electrode 190 may include a metal, an alloy, a metal nitride, a conductive metal oxide, a transparent conductive material, or the like. For example, the first electrode 190 may include aluminum (Al), an alloy containing aluminum, aluminum nitride (AlNx), silver (Ag), an alloy containing silver, tungsten (W), tungsten nitride (WNx), Copper (Cu), alloys containing copper, nickel (Ni), chromium (Cr), chromium nitride (CrNx), molybdenum (Mo), alloys containing molybdenum, titanium (Ti), titanium nitride ( TiNx), platinum (Pt), tantalum (Ta), tantalum nitride (TaNx), neodymium (Nd), scandium (Sc), strontium ruthenium oxide (SRO), zinc oxide (ZnOx), indium tin oxide (ITO), tin It may include oxide (SnOx), indium oxide (InOx), gallium oxide (GaOx), indium zinc oxide (IZO), and the like. These may be used alone or in combination with each other.

Referring back to FIG. 1 , the emission layer 210 may be disposed on the first electrode 190 . The emission layer 210 may include a hole injection layer (HIL), a hole transport layer (HTL), an organic emission layer (EML), an electron transport layer (ETL), an electron injection layer (EIL), and the like. The organic emission layer of the emission layer 210 may include emission materials capable of emitting light of different colors, such as red light, green light, and blue light, depending on the types of pixels of the display device 100 . In other exemplary embodiments, the organic light emitting layer of the light emitting layer 210 may emit white light as a whole by stacking a plurality of light emitting materials capable of generating light of different colors such as red light, green light, and blue light. In example embodiments, the display device 100 may have a resonance structure including the insulating layer 130 , the interlayer insulating layer 170 , the first electrode 190 , the second electrode 250 , and the like. In this case, the lights generated from the light emitting layer 210 may be emitted while substantially overlapping each other.

The pixel defining layer 230 may be disposed on the first electrode 190 and the emission layer 210 . The pixel defining layer 230 may cover the first electrode 190 and the emission layer 210 in the peripheral region II. A region to which the emission layer 210 is exposed by the pixel defining layer 230 may be referred to as a display region I of the display device 100 , and a region adjacent thereto is a peripheral region II of the display device 100 . can be mentioned as The pixel defining layer 230 may be formed of an inorganic insulating material such as silicon oxide, silicon nitride, silicon oxynitride, silicon oxycarbide, or silicon carbonitride. In other exemplary embodiments, the pixel defining layer 230 may be made of an organic material. For example, the pixel defining layer 230 may include a polyimide-based resin, a photoresist, an acrylic resin, a polyamide-based resin, or a siloxane-based resin. These may be used alone or in combination with each other.

The second electrode 250 may be disposed on the pixel defining layer 230 and the emission layer 210 . The second electrode 250 may include a metal, an alloy, a metal nitride, a conductive metal oxide, a transparent conductive material, or the like. For example, the second electrode 250 may include aluminum, an alloy containing aluminum, aluminum nitride, silver, an alloy containing silver, tungsten, tungsten nitride, copper, an alloy containing copper, nickel, chromium, chromium nitride, Molybdenum, alloys containing molybdenum, titanium, titanium nitride, platinum, tantalum, tantalum nitride, neodymium, scandium, strontium ruthenium oxide, zinc oxide, indium tin oxide, tin oxide, indium oxide, gallium oxide, indium zinc oxides and the like. These may be used alone or in combination with each other.

The protective layer 270 may be disposed on the second electrode 250 . The passivation layer 270 may be formed using silicon oxide, metal oxide, or the like. For example, the passivation layer 270 may include silicon oxide, silicon nitride, silicon oxynitride, silicon oxycarbide, silicon carbonitride, hafnium oxide, aluminum oxide, zirconium oxide, titanium oxide, tantalum oxide, or the like. These may be used alone or in combination with each other. The protective layer 270 may protect the lower structure including the second electrode 250 from an external environment or impact.

The light blocking member 310 may be disposed in the peripheral region II of the second substrate 290 . The light blocking member 310 may be formed of a metal, a metal oxide, or the like. For example, the light blocking member 310 may include chromium (Cr), chromium oxide (CrOx), or the like. The light blocking member 310 may have a color that reflects light in order to block light incident from the outside. For example, the color of the light blocking member 310 may be substantially black.

The second substrate 290 may be disposed on the passivation layer 270 while substantially facing the first substrate 110 . The second substrate 290 may be made of a transparent inorganic material or flexible plastic. For example, the second substrate 290 may include a glass substrate, a quartz substrate, a transparent plastic substrate, or the like.

According to example embodiments, as shown in FIG. 1 , a light scattering structure 295 may be positioned in the display area I of the second substrate 290 . The light scattering structure 295 may correspond to a recess having a substantially semi-circular or semi-elliptical rounded bottom surface. For example, when the length of the display area I is about 20 μm to about 30 μm, the recessed light scattering structure 295 may have a depth of about 1 μm or less.

According to example embodiments, when the display device 100 has the resonance structure, a portion of the light generated from the emission layer 210 may pass through the second electrode 250 according to the transmittance of the second electrode 250 . and the remaining portion of the light may be reflected by the second electrode 250 . The reflected light may be reflected by the first electrode 190 or may be reflected by a lower structure including the interlayer insulating layer 170 , the switching element 150 and the insulating layer 130 . For example, when the display device 100 is a top emission type, the first electrode 190 and/or the lower structure may reflect substantially all of the light reflected by the second electrode 250 . The reflected light may pass through the second electrode 250 , and may substantially overlap with light that has previously passed through the second electrode 250 . Such a process may be continuously repeated, and accordingly, an intensity higher than the intensity of light of a non-resonant structure may be secured. In the display device 100 having a resonance structure according to example embodiments, as the intensity of the light increases, the straightness of the light may also substantially increase. When the light emitted from the emission layer 210 has strong linearity, a color shift may occur in the image displayed by the display device 100 . For example, when the user views the display device 100 from the side, a color shift of the image appears. In order to reduce or eliminate the color shift of the image, the second substrate 290 may include the light scattering structure 295 having the recess shape. For example, when the overlapped light passes through the second substrate 290 having the recess-shaped light scattering structure 295 as described above, the overlapped light may be efficiently scattered. Accordingly, the quality of the image displayed by the display device 100 may be improved by reducing or eliminating the color shift phenomenon of the image displayed by the display device 100 .

2A to 2E are cross-sectional views illustrating a method of manufacturing a display device according to exemplary embodiments of the present invention.

Referring to FIG. 2A , after the insulating layer 130 is formed on the first substrate 110 , the switching device 150 may be formed on the insulating layer 130 .

The first substrate 110 may be formed of a transparent material or a flexible material, and the insulating layer 130 may be formed of an inorganic material or an organic material. The switching element 150 may be obtained according to general transistor manufacturing processes.

An interlayer insulating layer 170 covering the switching element 150 may be formed on the insulating layer 130 . The interlayer insulating layer 170 may be formed using silicon oxide, metal oxide, or the like.

Referring to FIG. 2B , a first electrode 190 may be formed on the interlayer insulating layer 170 . The first electrode 190 may be formed using a metal, an alloy, a metal nitride, a conductive metal oxide, a transparent conductive material, or the like.

A light emitting layer 210 may be formed on the first electrode 190 . The emission layer 210 may have a multilayer structure including an organic emission layer (EL), a hole injection layer (HIL), a hole transport layer (HTL), an electron transport layer (ETL), an electron injection layer (EIL), and the like. In example embodiments, the organic light emitting layer of the light emitting layer 210 may be formed by stacking light emitting materials capable of generating different color lights, such as red light, green light, and blue light, depending on the types of pixels. According to other exemplary embodiments, the organic light emitting layer may emit white light as a whole by stacking a plurality of light emitting materials capable of generating different color lights, such as red light, green light, and blue light.

Referring to FIG. 2C , a pixel defining layer 230 may be formed on the emission layer 210 and the first electrode 190 . An opening partially exposing the emission layer 210 may be formed in the pixel defining layer 230 . The pixel defining layer 230 may be formed using an organic material or an inorganic material.

The second electrode 250 may be formed on the pixel defining layer 230 and the emission layer 210 . The second electrode 250 may be formed using a metal, an alloy, a metal nitride, a conductive metal oxide, a transparent conductive material, or the like.

A protective layer 270 may be formed on the second electrode 250 . The passivation layer 270 may be formed using silicon oxide, metal oxide, or the like.

Referring to FIG. 2D , a second substrate 290 may be disposed on the passivation layer 270 . The second substrate 290 may be formed using a transparent inorganic material, a material having flexibility, or the like.

A light blocking member 310 may be formed on the second substrate 290 . The light blocking member 310 may be formed using a metal, a metal oxide, or the like. In example embodiments, after a metal layer (not shown) or a metal oxide layer (not shown) is formed on the second substrate 290 , the metal layer or the metal oxide layer is partially etched to form a second The light blocking member 310 may be formed only in a peripheral area of the substrate 290 . That is, the light blocking member 310 may expose the display area of the second substrate 290 .

Referring to FIG. 2E , a light scattering structure 295 may be formed in the display area of the second substrate 290 by removing a portion of the second substrate 290 that is exposed according to the formation of the light blocking member 310 . . In example embodiments, the light scattering structure 295 may be obtained by forming a recess having a substantially rounded bottom surface in the display area of the second substrate 290 . For example, the light scattering structure 295 may correspond to a recess having a substantially semi-elliptical shape or a substantially semi-circular bottom surface, similar to the case of a concave lens. In this case, the light blocking member 310 may function as a mask for forming the recessed light scattering structure 295 in the second substrate 290 . The recessed light scattering structure 295 effectively scatters the light generated from the light emitting layer 210 and amplified from the above-described resonance structure, thereby reducing or eliminating the color shift of the image, thereby improving the image quality. .

3 is a cross-sectional view illustrating a display device according to other exemplary embodiments of the present invention. The display device illustrated in FIG. 3 may have substantially the same or similar configuration to the display device 100 described with reference to FIG. 1 , except for the shape of the light scattering structure 285 . In FIG. 3 , descriptions of components substantially the same as or similar to those described with reference to FIG. 1 will be omitted.

Referring to FIG. 3 , a light scattering structure 285 in the form of a protrusion may be disposed in the display area I of the second substrate 280 , and in a peripheral area adjacent to the light scattering structure 285 ( II), the light blocking member 310 may be positioned. In example embodiments, the protrusions of the light scattering structure 285 may have a substantially rounded top surface. For example, the upper surface of the protrusion may have a substantially semi-elliptical shape, a substantially elliptical shape, or the like.

In example embodiments, the light scattering structure 285 forms an etch mask exposing the peripheral region II of the second substrate 280 on the second substrate 280 , and then uses the mask to By partially etching the second substrate 280 , the light scattering member 285 having a protrusion shape may be formed in the display area I of the second substrate 280 . For example, when the width of the display area I is about 20 μm to about 30 μm, the height of the protrusion may be about 1 μm or less. When the light scattering structure 285 has the protrusion shape similar to the case of the convex lens, the light scattering structure 285 absorbs the light generated from the light emitting layer 210 and the light amplified by the resonance structure, as described above. It can spawn effectively. Accordingly, since the color shift of the image can be reduced or eliminated, the display device can display an image with improved image quality.

4 is a cross-sectional view illustrating a display device according to still another exemplary embodiment of the present invention. In FIG. 4 , the same or similar reference numerals are used for the components described with reference to FIG. 1 , and detailed descriptions of these components will be omitted. The display device illustrated in FIG. 4 may have substantially the same or similar configuration to the display device 100 described with reference to FIG. 1 , except for the light scattering structure 335 .

Referring to FIG. 4 , the light scattering structure 335 formed in the display area I of the second substrate 330 may include a plurality of recesses disposed adjacent to each other. The light blocking member 310 may be disposed in the peripheral region II adjacent to the light scattering structure 335 including the plurality of recesses.

Although only two recesses are shown in FIG. 4 for convenience, the light scattering structure 335 may include three or more recesses. Here, each recess may have a rounded bottom surface, such as a substantially semi-elliptical shape, a substantially semi-circular shape. For example, when the width of the display area I is about 20 μm to about 30 μm, the depth of each recess may be about 0.5 μm or less. In the manufacturing process of the light scattering structure 335 according to example embodiments, it may be easier to form a plurality of recesses compared to a case where one recess is formed by etching the second substrate 330 . have. That is, the process of etching the second substrate 330 relatively deeply may be difficult to control and may cause damage to lower structures. Accordingly, it may be more advantageous to form a plurality of recesses by etching the second substrate 330 relatively shallowly.

When the light scattering structure 335 includes a plurality of recesses similarly to the plurality of concave lenses as described above, the light emitted from the light emitting layer 210 and the light whose intensity is increased by the resonance structure of the display device are absorbed. It can scatter more effectively. Accordingly, since the color shift shape of the image can be more efficiently reduced or removed, the quality of the image can be further improved.

5 is a cross-sectional view illustrating a display device according to still another exemplary embodiment of the present invention. In FIG. 5 , the same or similar reference numerals are used for the components described with reference to FIG. 1 , and detailed descriptions of these components will be omitted. The display device illustrated in FIG. 5 may have substantially the same or similar configuration to the display device 100 described with reference to FIG. 1 , except for the configuration of the light scattering structure 350 .

Referring to FIG. 5 , a light scattering structure including a transparent member 350 buried in a recess may be disposed in the display area I of the second substrate 290 . In example embodiments, the recess may have a rounded bottom, and the transparent member 350 filling the recess may also have a substantially rounded bottom. For example, the bottom surface of the transparent member 350 may have a substantially semi-elliptical shape, a substantially semi-circular shape, or the like. The light blocking member 310 may be disposed in the peripheral region II adjacent to the transparent member 350 .

In the light scattering structure including the recess and the transparent member 350 according to exemplary embodiments, after forming the recess in the second substrate 290 similarly to the process described with reference to FIG. 2E , the The tube scattering structure may be obtained by filling the transparent member 350 in the recess.

The transparent member 350 may be made of an organic material. In this case, the transparent member 350 may have a refractive index different from that of the second substrate 290 . For example, the transparent member 350 may be formed of a polyimide-based resin, a photoresist, an acrylic resin, a polyamide-based resin, or a siloxane-based resin. Since the light scattering structure including the transparent member 350 scatters light more effectively than the light scattering structure including only the recesses, image quality may be further improved.

6 is a cross-sectional view illustrating a display device according to still another exemplary embodiment of the present invention. In FIG. 6 , the same or similar reference numerals are used for the components described with reference to FIG. 1 , and detailed descriptions of these components will be omitted. The display device illustrated in FIG. 6 is substantially the same as or similar to the display device 100 described with reference to FIG. 1 , except for a light scattering structure including a plurality of recesses and a plurality of transparent members 355 . can have a configuration.

Referring to FIG. 6 , a light scattering structure including a plurality of recesses and a plurality of transparent members 355 filling the plurality of recesses is disposed in the display area I of the second substrate 330 . can be The light blocking member 310 may be located in the peripheral region II of the second substrate 330 adjacent to the transparent members 355 .

Each of the transparent members 355 may be made of an organic material having a refractive index different from that of the second substrate 330 , and may have a substantially semi-elliptical shape or a rounded bottom surface such as a substantially semi-circular shape. When the light scattering member includes the aforementioned recesses and the transparent members 355 , the light generated from the light emitting layer 210 may be more effectively scattered, and thus image quality may be further improved.

7 is a cross-sectional view illustrating a display device according to still another exemplary embodiment of the present invention. In FIG. 7 , the same or similar reference numerals are used for the components described with reference to FIG. 1 , and detailed descriptions of these components will be omitted. The display device illustrated in FIG. 7 may have a configuration substantially the same as or similar to that of the display device 100 described with reference to FIG. 1 , except for a light scattering structure including a plurality of protrusions 375 .

Referring to FIG. 7 , a light scattering structure that may be disposed in the display area I of the second substrate 370 may include a plurality of protrusions 375 . The light blocking member 310 may be located in the peripheral region II of the second substrate 370 adjacent to the protrusions 375 . Here, each of the protrusions 375 may have a substantially rounded upper surface. For example, each of the protrusions 375 may have a substantially semi-elliptical shape, a substantially elliptical shape, or the like, similar to that of a convex lens. When the light scattering structure includes the plurality of protrusions 375 , light can be scattered more efficiently compared to the display device described with reference to FIG. 3 , so that the display device can provide an image of improved quality. can The light scattering member including the plurality of protrusions 375 can be easily obtained only by changing the shape of the etch mask for etching the second substrate 370 .

8 is a cross-sectional view illustrating a display device according to still another exemplary embodiment of the present invention. In FIG. 8 , the same or similar reference numerals are used for the components described with reference to FIG. 1 , and detailed descriptions of these components will be omitted. The display device illustrated in FIG. 8 may have substantially the same or similar configuration to the display device 100 described with reference to FIG. 1 , except for the configuration of the second substrate 700 and the light scattering structure 595 .

Referring to FIG. 8 , the second substrate 700 may have a configuration in which at least one organic layer and at least one inorganic layer are stacked. In example embodiments, the second substrate 700 may have a configuration in which organic layers 570 and inorganic layers 590 are alternately disposed on the protective layer 250 . The light scattering structure 595 including the recess may be formed in at least one inorganic layer 590 and at least one organic layer 570 . For example, the light scattering structure 595 may be formed on the uppermost inorganic layer 590 and the uppermost organic layer 570 .

According to example embodiments, each organic layer 570 may be formed of a transparent organic material. For example, each organic layer 570 may include a polyimide-based resin, a photoresist, an acrylic resin, a polyamide-based resin, or a siloxane-based resin. These may be used alone or in combination with each other. Each inorganic layer 590 may be made of a transparent inorganic material. For example, each inorganic layer 590 may include silicon oxide, silicon nitride, silicon oxynitride, silicon oxycarbide, silicon carbonitride, or the like. These may be used alone or in combination with each other. The second substrate 700 including the plurality of organic layers 570 and the plurality of inorganic layers 590 includes display structures (eg, an insulating layer, a switching device, an interlayer insulating layer, a first electrode, and a light emitting layer). , pixel defining layer, second electrode, and protective insulating layer) can be effectively prevented from being deteriorated due to penetration of moisture, oxygen, and the like. In addition, since the display device may include a light scattering structure formed on the organic layer(s) 570 and the inorganic layer(s) 590 , the display device scatters light generated from the emission layer 210 to display the display device. It is possible to improve the quality of the image displayed by the device.

9 is a cross-sectional view illustrating a display device according to still another exemplary embodiment of the present invention. In FIG. 9 , the same or similar reference numerals are used for the components described with reference to FIG. 1 , and detailed descriptions of these components will be omitted. The display device illustrated in FIG. 9 may have substantially the same or similar configuration to the display device 100 described with reference to FIG. 1 , except for the second substrate 700 and the light scattering structure 598 .

Referring to FIG. 9 , the second substrate 700 may have a configuration in which at least one organic layer 570 and at least one inorganic layer 590 are alternately stacked. In example embodiments, the light scattering structure 598 positioned in the display area I of the second substrate 700 may include a protrusion formed on the uppermost inorganic layer 590 . For example, the protrusions of the light scattering structure 598 may have a substantially semi-elliptical shape or a rounded top surface such as a substantially semi-circular shape.

In other exemplary embodiments, the uppermost layer of the second substrate 700 may be an organic layer 570 , in which case the light scattering structure 598 includes projections formed on the uppermost organic layer 570 . can be provided

10 is a cross-sectional view illustrating a display device according to still another exemplary embodiment of the present invention. In FIG. 10 , the same or similar reference numerals are used for the components described with reference to FIG. 1 , and detailed descriptions of these components will be omitted. The display device illustrated in FIG. 10 may have substantially the same or similar configuration to the display device 100 described with reference to FIG. 1 , except for the second substrate 700 and the light scattering structure 599 .

Referring to FIG. 10 , the second substrate 700 may include a plurality of organic layers 570 and a plurality of inorganic layers 590 that are alternately disposed with each other, and the display area ( The light scattering structure 599 located at I) may include a plurality of recesses. Here, the recesses of the light scattering structure 599 may be formed in the uppermost inorganic layer 590 and the uppermost organic layer 570 , respectively.

11 is a cross-sectional view illustrating a display device according to still another exemplary embodiment of the present invention. In FIG. 11 , the same or similar reference numerals are used for the components described with reference to FIG. 1 , and detailed descriptions of these components will be omitted. The display device illustrated in FIG. 11 has a configuration substantially the same as or similar to that of the display device 100 described with reference to FIG. 1 , except for a light scattering structure including the second substrate 700 and the transparent member 630 . can have Also, the second substrate 700 of the display device may have substantially the same configuration as the second substrate 700 of the display device described with reference to FIG. 8 .

Referring to FIG. 11 , light scattering including a recess and a transparent member 630 in the display area I of the second substrate 700 including a plurality of organic layers 570 and a plurality of inorganic layers 590 . A structure may be placed. The light blocking member 310 may be disposed in the peripheral region II of the second substrate 700 adjacent to the light scattering structure. In example embodiments, the transparent member 630 may have a refractive index different from that of the organic layer 570 of the second substrate 700 . Optionally, the transparent member 630 having the light scattering structure may have a refractive index different from that of the inorganic layer 590 of the second substrate 700 .

12 is a cross-sectional view illustrating a display device according to still another exemplary embodiment of the present invention. In FIG. 12 , the same or similar reference numerals are used for the components described with reference to FIG. 1 , and detailed descriptions of these components will be omitted. The display device illustrated in FIG. 12 is substantially the same as or similar to the display device 100 described with reference to FIG. 1 , except for the light scattering structure including the second substrate 700 and the plurality of transparent members 635 . can have a configuration.

Referring to FIG. 12 , the light scattering structure positioned in the display area I of the second substrate 700 including organic layers 570 and inorganic layers 590 includes a plurality of recesses and a plurality of the light scattering structures. A plurality of transparent members 635 may be provided to respectively fill the recesses. The light blocking member 310 may be located in the peripheral region II adjacent to the outermost transparent members 635 . Each of the transparent members 635 may have a refractive index different from that of the organic layers 570 and/or the inorganic layers 590 of the second substrate 700 .

13 is a cross-sectional view illustrating a display device according to still another exemplary embodiment of the present invention. In FIG. 13 , the same or similar reference numerals are used for the components described with reference to FIG. 1 , and detailed descriptions of these components will be omitted. The display device illustrated in FIG. 13 has a configuration substantially the same as or similar to that of the display device 100 described with reference to FIG. 1 , except for the light scattering structure including the second substrate 700 and the plurality of protrusions 640 . can have Also, the light scattering structure including the protrusions 640 illustrated in FIG. 13 may be substantially the same as the light scattering structure including the protrusions 375 described with reference to FIG. 7 .

Referring to FIG. 13 , the light scattering structure having a plurality of protrusions 640 may be disposed on a second substrate 700 including organic layers 570 and inorganic layers 590 . In example embodiments, the protrusions 640 of the light scattering structure may be disposed on the uppermost inorganic layer 590 in the display area I. The light blocking member 310 may be disposed in the peripheral region II adjacent to the protrusions 640 . For example, the light blocking member 310 may be positioned adjacent to the outermost protrusions 640 . In other exemplary embodiments, the protrusions 640 of the light scattering structure may be formed on the uppermost organic layer 570 .

In the above, the display device and the manufacturing process of the display device according to the embodiments of the present invention have been described with reference to the drawings, but the above description is exemplary and is not departing from the technical spirit of the present invention. It may be modified and changed by those who have For example, although it has been described above that the display device is an organic light emitting diode display, the type of the display device is not limited thereto.

The present invention can be variously applied to an electronic device having a display device. For example, the present invention provides a computer, a notebook computer, a digital camera, a video camcorder, a mobile phone, a smart phone, a smart pad, a PMP, a PDA, an MP3 player, a car navigation system, a video phone, a surveillance system, a tracking system, It can be applied to a motion detection system, an image stabilization system, and the like.

Although the above has been described with reference to the embodiments of the present invention, those of ordinary skill in the art can variously modify and change the present invention within the scope without departing from the spirit and scope of the present invention described in the claims below. You will understand that you can

100: display device 110: first substrate
130: insulating layer 150: switching element
170: interlayer insulating layer 190: first electrode
210: light emitting layer 230: pixel defining layer
250: second electrode 270: protective layer
280, 290, 330, 370, 700: second substrate 285, 375, 598, 640: protrusion
295, 335, 595, 599: light scattering structure 310: light blocking member
350, 355, 630, 635: transparent member 570: organic layer
590: inorganic layer

Claims (16)

a substrate having a display area and a peripheral area;
a light emitting part disposed in the display area on the substrate; and
A display device comprising: a light scattering structure positioned in the display area to scatter light emitted from the light emitting unit including at least one recess; and an encapsulation unit disposed on the light emitting unit. The method of claim 1, wherein the encapsulation unit comprises a plurality of organic layers and a plurality of inorganic layers arranged alternately,
The display device according to claim 1, wherein the recess is formed in an uppermost inorganic layer and an uppermost organic layer. The display device of claim 1 , wherein the recess has a rounded bottom surface. The display device of claim 1 , wherein the light scattering structure further comprises a transparent member buried in the recess. The display device of claim 4 , wherein the transparent member has a refractive index different from a refractive index of the encapsulation part. The display device of claim 5 , wherein the transparent member includes a polyimide-based resin, a photoresist, an acrylic resin, a polyamide-based resin, or a siloxane-based resin. The display device of claim 1 , wherein the light scattering structure includes a plurality of the recesses. The display device of claim 7 , wherein the light scattering structure further comprises a plurality of transparent members respectively buried in the plurality of recesses. a substrate having a display area and a peripheral area;
a light emitting part disposed in the display area on the substrate; and
A display device comprising: a light scattering structure positioned in the display area to scatter light generated from the light emitting unit including at least one protrusion; and an encapsulation unit disposed on the light emitting unit. The display device of claim 9 , wherein the protrusion has a rounded upper surface. The display device of claim 9 , wherein the light scattering structure includes a plurality of protrusions. 10. The method of claim 9, wherein the encapsulation unit comprises a plurality of organic layers and a plurality of inorganic layers arranged alternately,
The display device according to claim 1, wherein the protrusion is disposed on the uppermost inorganic layer. delete delete 10. The method according to claim 1 or 9,
and a light blocking member disposed in the peripheral area on the encapsulation part, exposing the light scattering structure, and having an opening through which the scattered light passes. The display device of claim 1 or 9, wherein the light scattering structure overlaps the light emitting part.

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