Organic light-emitting display device and method of manufacturing the same

An organic light-emitting display device and method of manufacturing the same are provided. An organic light-emitting display device includes: a substrate, an organic light-emitting device on the substrate, an encapsulation layer on the substrate and the organic light-emitting device, the encapsulation layer covering the organic light-emitting device, the encapsulation layer including an encapsulation hole, a black matrix covering the encapsulation layer, the black matrix including a black matrix hole over the encapsulation hole, and a color filter in the encapsulation hole and the black matrix hole.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims the priority of Korean Application No. 10-2016-0143786, filed on Oct. 31, 2016, the entirety of which is hereby incorporated by reference.

BACKGROUND

1. Technical Field

The present disclosure relates to an organic light-emitting display device and a method of manufacturing the same.

2. Discussion of the Related Art

With the advancement of an information-oriented society, various requirements for display devices for displaying an image are increasing. Therefore, various display devices, such as liquid crystal display (LCD) devices, plasma display panel (PDP) devices, organic light-emitting display devices, etc., are recently being used.

As a type of display device, organic light-emitting display devices are self-emitting display devices, and have better viewing angle and contrast ratio than LCD devices. Also, because the organic light-emitting display devices do not need a separate backlight, it is possible to lighten and thin the organic light-emitting display devices. Also, the organic light-emitting display devices are excellent in power consumption. Furthermore, the organic light-emitting display devices are driven with a low direct current (DC) voltage, have a fast response time, and are low in manufacturing cost.

The organic light-emitting display devices emit light using an organic light-emitting device. The organic light-emitting device may include a red organic light-emitting device emitting red light, a green organic light-emitting device emitting green light, and a blue organic light-emitting device emitting blue light, or may include only a white organic light-emitting device emitting white light. If the organic light-emitting device includes only the white organic light-emitting device, red, green, and blue color filters for respectively realizing red, green, and blue are needed. When a color filter is directly provided on the organic light-emitting device, a high temperature can affect the organic light-emitting device, and a low temperature curing color filter is used.

In the low temperature curing color filter, if a curing process is performed after an exposure process for forming the color filter, low temperature curing is performed in a state in which a dissolution rate difference occurs between a surface receiving more light and a bottom receiving relatively less light. For this reason, a cross-sectional structure has a reverse taper structure. A related art color filter formed in the reverse taper structure has a structure that is easily detached, causing the reduction in process stability and product reliability.

SUMMARY

Accordingly, the present disclosure is directed to an organic light-emitting display device and a method of manufacturing the same that substantially obviate one or more of the issues due to limitations and disadvantages of the related art.

An aspect of the present disclosure is to provide an organic light-emitting display device for reducing or preventing process stability and product reliability from being reduced.

To achieve these and other aspects of the inventive concepts as embodied and broadly described, there is provided an organic light-emitting display device, including: a substrate, an organic light-emitting device on the substrate, an encapsulation layer on the substrate and the organic light-emitting device, the encapsulation layer covering the organic light-emitting device, the encapsulation layer including an encapsulation hole, a black matrix covering the encapsulation layer, the black matrix including a black matrix hole over the encapsulation hole, and a color filter in the encapsulation hole and the black matrix hole.

In another aspect, there is provided a method of manufacturing an organic light-emitting display device, the method including: providing a substrate, providing a thin film transistor on the substrate, providing an organic light-emitting device, electrically connected to the thin film transistor, on the substrate, covering the organic light-emitting device with an encapsulation layer, covering the encapsulation layer with a black matrix, providing a photoresist pattern on the black matrix, over-etching an upper portion of the photoresist pattern to form a hole through the black matrix and into the encapsulation layer, and removing the photoresist pattern to form a color filter in the hole.

DETAILED DESCRIPTION

In the description of embodiments, when a structure is described as being positioned “on or above” or “under or below” another structure, this description should be construed as including a case in which the structures contact each other as well as a case in which a third structure is disposed therebetween.

FIG. 1is a perspective view illustrating an organic light-emitting display device according to an embodiment of the present disclosure.

With reference to theFIG. 1example, an organic light-emitting display device according to an embodiment of the present disclosure may include a substrate100, a pixel array layer200, an encapsulation layer300, a color filter layer400, and a touch sensing layer500. The substrate100, which may be a base substrate, may include a plastic material, a glass material, and/or the like. The substrate100may include a flexible plastic material, and, for example, may include opaque or colored polyimide (PI). The substrate100may be manufactured, for example, by curing polyimide resin that may be coated on an upper surface of a release layer provided on a relatively thick carrier substrate to have a particular thickness. The carrier substrate may be separated from the substrate100by releasing the release layer, e.g., through a laser release process.

Additionally, an organic light-emitting display device according to an embodiment of the present disclosure may further include a back plate that may be coupled to a bottom of the substrate100with respect to a vertical axis direction (e.g., a thickness direction of the substrate100). The back plate may maintain the substrate100in a planar state. The back plate may include a plastic material, for example, polyethyleneterephthalate (PET). The back plate may be laminated on the bottom of the substrate100separated from the carrier substrate, thereby maintaining the substrate100in a planar state.

The pixel array layer200may include a plurality of pixels P that may be provided on the substrate100to display an image. The plurality of pixels P may be respectively provided in a plurality of pixel areas defined by a plurality of gate lines, a plurality of data lines, and a plurality of pixel driving power lines. Each of the plurality of pixels P may be an area corresponding to a minimum unit in which actual light may be emitted, and may be defined as a subpixel. At least three adjacent pixels P may configure one unit pixel for displaying a color. For example, the one unit pixel may include a red pixel, a green pixel, and a blue pixel that may be adjacent to each other, and may further include a white pixel, e.g., for enhancing luminance.

Each of the pixels P according to an embodiment may include a pixel circuit. The pixel circuit may be provided in a circuit area defined in a corresponding pixel P, and may be connected to a gate line, a data line, and a pixel driving power line that may be adjacent thereto. The pixel circuit may control a current flowing in an organic light-emitting device according to a data signal supplied through the data line in response to a scan pulse supplied through the gate line, based on a pixel driving power supplied through the pixel driving power line. The pixel circuit according to an embodiment may include a switching thin film transistor (TFT), a driving TFT, and a capacitor.

The switching TFT and the driving TFT may each include a gate insulation layer, an active layer, a gate electrode, a source electrode, and a drain electrode. The switching TFT and the driving TFT may each be, for example, an amorphous silicon (a-Si) TFT, a poly-Si TFT, an oxide TFT, an organic TFT, or the like.

The switching TFT may include a gate electrode connected to the gate line, a first electrode connected to the data line, and a second electrode connected to a gate electrode of the driving TFT. Each of the first and second electrodes of the switching TFT may be a source electrode or a drain electrode, depending on a direction of a current. The switching TFT may be turned on by the scan pulse supplied through the gate line, and may supply the data signal, supplied through the data line, to the driving TFT.

The driving TFT may be turned on by a voltage supplied through the switching TFT and/or a voltage of the capacitor, and may control the amount of current flowing from the pixel driving power line to the organic light-emitting device. As such, the driving TFT according to an embodiment may include the gate electrode connected to the second electrode of the switching TFT, a source electrode connected to the pixel driving power line, and a drain electrode connected to the organic light-emitting device. The driving TFT may control a data current flowing from the pixel driving power line to the organic light-emitting device, based on the data signal supplied through the switching TFT, thereby allowing the organic light-emitting device to emit light having brightness proportional to the data signal.

The capacitor may be provided in an overlap area between the gate electrode and the source electrode of the driving TFT. The capacitor may store a voltage corresponding to the data signal supplied to the gate electrode, and may turn on the driving TFT with the stored voltage.

In addition, an organic light-emitting display device according to an embodiment of the present disclosure may further include a scan driving circuit that may be provided in a non-display area of the substrate100. The scan driving circuit may generate the scan pulse according to a gate control signal input thereto, and may supply the scan pulse to the gate line. The scan driving circuit according to an embodiment may be provided in an arbitrary non-display area, enabling the scan pulse to be supplied to the gate line, of the non-display area provided on the substrate100along with a TFT of the pixel.

The encapsulation layer300may be formed to cover the pixel array layer200, e.g., for reducing or preventing penetration of water from each pixel P to protect the organic light-emitting device that may be vulnerable to external water or oxygen. That is, the encapsulation layer300may be provided on the substrate100to cover the below-described second electrode. The encapsulation layer300may be formed of an inorganic material layer or an organic material layer, or may be formed in a multi-layer structure, for example, in which an inorganic material layer and an organic material layer may be alternately stacked.

The color filter layer400may be disposed on the encapsulation layer300, and may convert a color of white light emitted from the pixel P. The color filter layer400may be directly provided on the pixel array layer200and the encapsulation layer300. Thus, the color filter layer400may be formed through a low temperature process.

The touch sensing layer500may be directly provided on the color filter layer400of the organic light-emitting display panel, for sensing a position of a user touch. That is, the touch sensing layer500may not be separately manufactured, and may not be indirectly coupled to an upper surface of the color filter layer400by a separate optical adhesive. The touch sensing layer500may be directly formed on the color filter layer400.

FIG. 2is a cross-sectional view taken along line I-I ofFIG. 1and illustrates a substrate, a pixel array layer, a color filter layer, and an encapsulation layer according to an embodiment of the present disclosure.

With reference to theFIG. 2example, a pixel array layer200according to an embodiment of the present disclosure may include a gate insulation layer210, a TFT220, an interlayer dielectric230, a passivation layer240, a pixel planarization layer250, an organic light-emitting device260, and a bank270. The TFT220may include an active layer221, a gate electrode222, a source electrode223, and a drain electrode224.

The active layer221may be disposed on the substrate100. The active layer221may be formed, e.g., of a silicon-based semiconductor material or an oxide-based semiconductor material. A light blocking layer for blocking external light incident on the active layer221and a buffer layer for protecting the TFT220and the organic light-emitting device260from water may be additionally provided under the active layer221.

The gate insulation layer210may be formed on the active layer221. The gate insulation layer220may be formed, e.g., of an inorganic layer, for example, silicon oxide (SiOx), silicon nitride (SiNx), or a multilayer thereof. The gate electrode222may be disposed on the gate insulation layer210. A gate line may be formed on the gate insulation layer210. The gate electrode222and the gate line may each be formed, for example, of a single layer or a multilayer that may include one or more of: molybdenum (Mo), aluminum (Al), chromium (Cr), gold (Au), titanium (Ti), nickel (Ni), neodymium (Nd), and copper (Cu), and an alloy thereof.

The interlayer dielectric230may be formed on the gate electrode222. The interlayer dielectric230may be formed of an inorganic layer, for example, SiOx, SiNx, or a multilayer thereof.

The source electrode223and the drain electrode224may be disposed on the interlayer dielectric230. A data line may be disposed on the interlayer dielectric230. The source electrode223may contact the active layer221, e.g., through a contact hole CT1that may pass through the gate insulation layer210and the interlayer dielectric230. The drain electrode224may contact the active layer221, e.g., through another contact hole CT1that may pass through the gate insulation layer210and the interlayer dielectric230. The source electrode223, the drain electrode224, and the data line may each be formed, e.g., of a single layer or a multilayer which may include, for example, one or more of: Mo, Al, Cr, Au, Ti, Ni, Nd, and Cu, and an alloy thereof.

InFIG. 2, the TFT220is illustrated as having a top-gate type in which the gate electrode222is disposed on the active layer221, but embodiments are not limited thereto. For example, the TFT220may be formed as a bottom-gate type in which the gate electrode222is disposed under the active layer221, or a double-gate type in which the gate electrode222is disposed both on and under the active layer221.

The passivation layer240may be disposed on the source electrode223, the drain electrode224, and the data line. The passivation layer240may insulate the TFT220. The passivation layer240may be formed, for example, of an inorganic layer, for example, SiOx, SiNx, or a multilayer thereof.

The pixel planarization layer250may be formed on the passivation layer240. The pixel planarization layer250may planarize a step height caused by the TFT220on the passivation layer240. The pixel planarization layer250may be formed, for example, of an organic layer, such as acryl resin, epoxy resin, phenolic resin, polyamide resin, polyimide resin, and/or the like.

The organic light-emitting device260and the bank270may be disposed on the pixel planarization layer250. The organic light-emitting device260may include a first electrode261, an organic light-emitting layer262, and a second electrode263. The first electrode261may be an anode electrode. The second electrode263may be a cathode electrode.

The first electrode261may be disposed on the pixel planarization layer250. The first electrode261may be connected to the drain electrode224of the TFT220, e.g., through a contact hole CT2that may pass through the passivation layer240and the pixel planarization layer250. The first electrode261may be formed, e.g., of a conductive material, which may be high in reflectance, such as a stacked structure (Ti/Al/Ti) of Al and Ti, a stacked structure (ITO/Al/ITO) of Al and indium tin oxide (ITO), an APC alloy, a stacked structure (ITO/APC/ITO) of an APC alloy and ITO, and/or the like. The APC alloy may be an alloy of silver (Ag), palladium (Pd), and Cu. Embodiments are not limited to these examples.

The bank270may be disposed on the pixel planarization layer250to overlap the first electrode261. The bank270may be disposed on the first electrode261in the contact hole CT2. An emissive area of the pixel may be defined as an area in which the first electrode261, the organic light-emitting layer262, and the second electrode263may be sequentially stacked to emit a particular light. For example, the first electrode261, the organic light-emitting layer262, and the second electrode263may be sequentially stacked in an area in which the bank270is not provided. Therefore, the bank270may divide the emissive area, and may define the emissive area.

The organic light-emitting layer262may be disposed on the first electrode261. The organic light-emitting layer262may be a white light-emitting layer that may emit white light. For example, the organic light-emitting layer262may be formed in a tandem structure of two or more stacks. Each of the stacks may include a hole transporting layer, at least one light-emitting layer, and an electron transporting layer. The organic light-emitting layer262may be formed, for example, in a deposition process or a solution process. When formed in the deposition process, the organic light-emitting layer262may be formed in an evaporation process.

The second electrode263may be disposed on the organic light-emitting layer262. The second electrode263may be disposed on the bank270. The second electrode263may be formed, for example, of a transparent conductive material (TCO), such as indium tin oxide (ITO) or indium zinc oxide (IZO), capable of transmitting light, or a semi-transmissive conductive material, such as Mg, Ag, or an alloy of Mg and Ag. A capping layer may be disposed on the second electrode263. The second electrode263may be formed, for example, through a physical vapor deposition (PVD) process, such as a sputtering process.

The encapsulation layer300may be disposed on the second electrode263. The encapsulation layer300may reduce or prevent oxygen or water from penetrating into the organic light-emitting layer262and the second electrode263. As such, the encapsulation layer300may include at least one inorganic layer and at least one organic layer. The encapsulation layer300may be formed, for example, through a physical vapor deposition (PVD) process, such as a sputtering process.

The encapsulation layer300may include a first inorganic layer301, an organic layer302, and a second inorganic layer303. For example, the first inorganic layer301may be disposed on the second electrode263to cover the second electrode263. The organic layer302may be disposed on the first inorganic layer301to cover the first inorganic layer301. To reduce or prevent particles from penetrating into the organic light-emitting layer262and the second electrode263via the first inorganic layer301, the organic layer302may have a sufficient thickness in consideration of reducing or preventing the penetration of the particles. The second inorganic layer303may be disposed on the organic layer302to cover the organic layer302.

The first inorganic layer301may be disposed closest to the organic light-emitting device260, and may be formed, e.g., of an inorganic insulating material, which may be capable of being deposited at a low temperature, such as nitride silicon (SiNx), oxide silicon (SiOx), oxynitride silicon (SiON), oxide aluminum (Al2O3), and/or the like. For example, because the organic light-emitting layer262has a characteristic that may be vulnerable to a high temperature, the first inorganic layer301may be formed by a low temperature process using a low temperature atmosphere, for example, 100° (degrees) C. or less. Accordingly, the organic light-emitting layer260may be prevented from being damaged (or may reduce damage) by a high temperature atmosphere applied to a process chamber when forming the first inorganic layer301.

The organic layer302may be provided on the substrate100to cover a whole upper surface of the first inorganic layer301. The organic layer302may relax a stress between layers caused by bending of the organic light-emitting display device. The organic layer302may include, for example, an organic material, such as benzocyclobutadiene (BCB), acryl, polyimide, silicon oxycarbon (SiOC), and/or the like.

The second inorganic layer303may be provided on the substrate100to cover a whole upper surface of the organic layer302. The second inorganic layer303may primarily reduce or prevent water or oxygen from penetrating into the organic layer302and the first inorganic layer301from the outside of the organic light-emitting display device. The second inorganic layer303may be formed, e.g., of an inorganic insulating material, which may be capable of being deposited at a low temperature, such as nitride silicon (SiNx), oxide silicon (SiOx), oxynitride silicon (SiON), oxide aluminum (Al2O3), and/or the like.

A hole H (e.g., holes H1, H2, H3) may be provided in the second inorganic layer303. In a process of forming the hole H for providing a color filter420in a black matrix410, if an etching process is continuously performed even after the black matrix410is removed, over-etching may be performed. Thus, a portion of the second inorganic layer303may be removed. The hole H may be provided in the black matrix410to extend to a lower surface of the black matrix410.

The color filter layer400may be disposed on the encapsulation layer300, and may convert a color of white light emitted from a pixel P. The color filter layer400according to an embodiment may include the black matrix410for reducing or preventing color mixture, a color filter420having one or more colors (e.g., color filters421,422,423), and a filter planarization layer430for planarizing an upper surface of the color filter420.

The black matrix410may be disposed on the encapsulation layer300to cover the encapsulation layer300. The black matrix410may be disposed in a boundary between adjacent pixels P to overlap the bank270. The black matrix410may reduce or prevent light emitted from each of a plurality of pixels P from being leaked to an adjacent pixel P, and may enable each pixel P to realize a gray level. The hole H may be provided in the black matrix410to pass through the black matrix410. The color filter420overlapping the organic light-emitting layer262may be disposed in the hole H.

The black matrix410may include a plurality of metal layers. Therefore, the black matrix410may act as a frame when forming the color filter420, thereby reducing or preventing deformation of a shape of the color filter420. The black matrix410according to an embodiment may include a reflective layer411, a light path change layer412, and a semi-transmissive layer413.

The reflective layer411may be directly disposed on an upper surface of the encapsulation layer300. The reflective layer411according to an embodiment may include, for example, MoTi or Mo.

The light path change layer412may be disposed on the reflective layer411. The light path change layer412may include, for example, ITO or IZO. The light path change layer412may include, e.g., SiO2, SiNx, Al2O3, and/or the like. The light path change layer412may be disposed between the reflective layer411and the semi-transmissive layer413, e.g., to cause destructive interference based on a light path difference.

The semi-transmissive layer413may be disposed on the light path change layer412. The semi-transmissive layer413may include MoTi or Mo. The semi-transmissive layer413may be formed of the same material as that of the reflective layer411.

The color filter420may be provided in the hole H provided in the adjacent black matrix410. For example, a first color filter421may be disposed in a first hole H1, a second color filter422may be disposed in a second hole H2, and a third color filter423may be disposed in a third hole H3. For example, the first color filter421may be a red color filter, the second color filter422may be a green color filter, and the third color filter423may be a blue color filter. The color filter420may be formed to fill the hole H. Due to a process margin, the color filter420may be formed on an upper surface of the black matrix410to surround an end of the black matrix410. However, embodiments are not limited thereto. For example, the color filter420may be formed to fill only the hole H.

When the color filter420is directly formed on the organic light-emitting device260, a high temperature can affect the organic light-emitting device260. Thus, a low temperature curing color filter may be used. Because the black matrix410may include the metal layer, deformation may not be easy. Therefore, if the color filter420is formed in the hole H provided in the black matrix410, the black matrix410may act as a frame of the color filter420. Due to a dissolution rate difference between a surface receiving much light and a bottom receiving relatively less light, the color filter may not have the reverse taper structure.

Moreover, in an organic light-emitting display device according to an embodiment of the present disclosure, the hole H may be provided to extend the second inorganic layer303of the encapsulation layer300disposed on a lower surface of the black matrix410. Thus, when the color filter420is formed in the hole H, a lower portion of the color filter420may be hung on the lower surface of the black matrix410, e.g., in a hook shape. Accordingly, the color filter420may be disposed to contact the lower surface of the black matrix410. Thus, the color filter420may not be detached by an external force, thereby reducing or preventing the process stability and product reliability of the organic light-emitting display device from being reduced.

The filter planarization layer430may be disposed to cover the black matrix410and the color filter420. The filter planarization layer430may planarize a step height caused by the color filter420on the black matrix410. The filter planarization layer430may be formed, e.g., of an organic layer, such as acryl resin, epoxy resin, phenolic resin, polyamide resin, polyimide resin, and/or the like.

In an organic light-emitting display device according to an embodiment of the present disclosure, because the black matrix410may include the metal layer, deformation may not be easily made. Thus, the black matrix410may act as a frame of the color filter420. Accordingly, due to a dissolution rate difference between a surface receiving more light and a bottom receiving relatively less light, the color filter420may not have a reverse taper structure. Also, in an organic light-emitting display device according to an embodiment of the present disclosure, because the color filter420may be disposed to contact the lower surface of the black matrix410, the color filter420may not be detached by an external force, thereby reducing or preventing the process stability and product reliability of the organic light-emitting display device from being reduced. The substrate100, the pixel array layer200, the encapsulation layer300, and the color filter layer400may configure an organic light-emitting display panel.

FIG. 3is a plan view illustrating a touch sensing layer of an organic light-emitting display device according to an embodiment of the present disclosure.

With reference to theFIG. 3example, a touch sensing layer500according to an embodiment of the present disclosure may include a touch driving line TD and a touch sensing line TS which are provided on the color filter layer400. The touch driving line TD may include a plurality of first touch electrodes TE1and a first bridge550that may electrically connect the plurality of first touch electrodes TE1.

The plurality of first touch electrodes TE1may be arranged along a first direction, and may be spaced apart from each other by a particular interval. Each of the plurality of first touch electrodes TE1may have a rectangular shape, an octagonal shape, a circular shape, a lozenge shape, or the like. Each of the plurality of first touch electrodes TE1may be electrically connected to an adjacent first touch electrode TE1, e.g., through the first bridge550. The first bridge550may be electrically connected to the first touch electrodes TE1without a separate contact hole.

The touch sensing line TS may include a plurality of second touch electrodes TE2and a second bridge510that may electrically connect the plurality of second touch electrodes TE2. The plurality of second touch electrodes TE2may be arranged along a second direction vertical to the first direction, and may be spaced apart from each other by a particular interval. Each of the plurality of second touch electrodes TE2may have a rectangular shape, an octagonal shape, a circular shape, a lozenge shape, or the like. Each of the plurality of second touch electrodes TE2may be electrically connected to an adjacent second touch electrode TE2, e.g., through the second bridge510. The second bridge510may be electrically connected to the second touch electrodes TE2, e.g., through a contact hole CT3.

As described above, the touch sensing line TS may intersect the touch driving line TD with the touch insulation layer520therebetween. Thus, a mutual capacitor having a mutual capacitance may be provided in an intersection portion of the touch sensing line TS and the touch driving line TD. Accordingly, the mutual capacitor may be charged with an electric charge by a touch driving pulse supplied through the touch driving line TD, and may discharge the charged electric charge to the touch sensing line TS, thereby acting as a touch sensor.

FIG. 4is a cross-sectional view taken along line II-II ofFIG. 3and illustrates a touch sensing layer of an organic light-emitting display device according to an embodiment of the present disclosure.

With reference to theFIG. 4example, a touch sensing layer500of an organic light-emitting display device according to an embodiment of the present disclosure may include a second bridge510, a touch insulation layer520, a plurality of transparent conductive layers530and535, a mesh metal layer540, and a first bridge550. The second bridge510may be a bridge electrode that may electrically connect adjacent second touch electrodes TE2. The second bridge510may be provided on a layer different from the second touch electrodes TE2, and may electrically connect two adjacent second touch electrodes TE2that may be separated from each other by the first bridge550. For example, the first bridge550and the second bridge510may be electrically disconnected from each other, e.g., by the touch insulation layer520.

The second bridge510may be electrically connected to the second touch electrodes TE2, e.g., through a contact hole CT3. Foe example, the second bridge510may be electrically connected to the transparent conductive layer530through the contact hole CT3that may pass through the touch insulation layer520. The second bridge510may be disposed to overlap a bank270, thereby reducing or preventing an aperture ratio from being damaged by the second bridge510.

The second bridge510may be directly provided on an upper surface of a color filter layer400, and may include at least three metal layers. The second bridge510may include a reflective layer511, a light path change layer512, and a semi-transmissive layer513.

The reflective layer511may be directly disposed on the upper surface of the color filter layer400. The reflective layer511may include, for example, MoTi or Mo. Because MoTi is high in adhesive force, MoTi may reduce or prevent the reflective layer511from being stripped from the encapsulation layer300, and a reflectance may be low.

The light path change layer512may be disposed on the reflective layer511. The light path change layer512may include, for example, ITO or IZO. The light path change layer512may include, for example, SiO2, SiNx, Al2O3, and/or the like. The light path change layer512may be disposed between the reflective layer511and the semi-transmissive layer513, e.g., to cause destructive interference based on a light path difference. For example, some of external light incident on the semi-transmissive layer513may be reflected as first reflection light by the light path change layer512, and the other light of the external light that may pass through the light path change layer512without being reflected by the light path change layer512may be reflected as second reflection light to the reflective layer511via the light path change layer512. However, the first and second reflection lights may be dissipated by the destructive interference. As such, a thickness of the light path change layer512may be set for the first and second reflection lights to be dissipated by destructive interference caused by a phase difference.

Therefore, in the second bridge510, destructive interference may occur in external light incident by the light path change layer512. As such, reflectance may be reduced. Accordingly, an organic light-emitting display device according to an embodiment of the present disclosure may reduce or prevent image visibility from being reduced at an outdoor place without a polarizer required by the related art, thereby enhancing image quality.

The semi-transmissive layer513may be disposed on the light path change layer512. The semi-transmissive layer513may include, for example, MoTi or Mo. The semi-transmissive layer513may be formed of the same material as that of the reflective layer511. For example, the semi-transmissive layer513may be thinner than that of the reflective layer511. Thus, the semi-transmissive layer513may semi-transmit external light incident thereon. A total deposition thickness of the second bridge510may be in a range of, e.g., 500 Å˜2000 Å, based on a reflectance.

The touch insulation layer520may be provided on the color filter layer400to cover the second bridge510. The touch insulation layer520may be formed of an organic material or an inorganic material. If the touch insulation layer520is formed of the organic material, the touch insulation layer520may be provided through a coating process of coating the organic material on the color filter layer400and a curing process of curing the coated organic material at a temperature of 100° (degrees C.) or less. If the touch insulation layer520is formed of the inorganic material, the touch insulation layer520may be formed of the inorganic material deposited on the encapsulation layer300, e.g., through a low temperature chemical deposition process and a cleaning process which may be alternately performed twice or more. Subsequently, the touch insulation layer520may be patterned, e.g., through a photolithography process and an etching process. Thus, the contact hole CT3may be formed.

The first bridge550, the first touch electrodes TE1, and the second touch electrodes TE2may be directly provided on an upper surface of the touch insulation layer520. The first bridge550may overlap the second bridge510. The first bridge550and the first and second touch electrodes TE1and TE2may include the transparent conductive layers530and535and the mesh metal layer540.

The transparent conductive layers530and535may be disposed on the touch insulation layer520. The transparent conductive layer530may be electrically connected to the second bridge510through the contact hole CT3passing through the touch insulation layer520.

The transparent conductive layers530and535may each include an amorphous transparent conductive material, for example, amorphous ITO. For example, to reduce, prevent, or minimize a damage of the pixel array layer200caused by a process temperature for forming the transparent conductive layers530and535, the transparent conductive layers530and535may be formed of the amorphous transparent conductive material through a low temperature deposition process using a process temperature of 100° (degrees) C. or less. That is, when the transparent conductive layers530and535are formed of a crystalline transparent conductive material, the pixel array layer200may be damaged by a high temperature thermal treatment process that may be performed for securing a low resistance value. Therefore, the transparent conductive layers530and535may be formed of the amorphous transparent conductive material through a low temperature metal deposition process.

The mesh metal layer540may be disposed on the transparent conductive layers530and535. The mesh metal layer540may include at least three metal layers. The mesh metal layer540may include a reflective layer541, a light path change layer542, and a semi-transmissive layer543.

The reflective layer541may be provided on the transparent conductive layer530. The reflective layer541may include, for example, MoTi or Mo. MoTi is high in adhesive force and is low in reflectance.

The light path change layer542may be disposed on the reflective layer541. The light path change layer542may include, for example, ITO or IZO. The light path change layer542may include, for example, SiO2, SiNx, Al2O3, and/or the like. The light path change layer542may be disposed between the reflective layer541and the semi-transmissive layer543, e.g., to cause destructive interference based on a light path difference. Therefore, in the mesh metal layer540, destructive interference may occur in external light incident by the light path change layer542. Thus, reflectance may be reduced. Accordingly, an organic light-emitting display device according to an embodiment of the present disclosure may reduce or prevent image visibility from being reduced at an outdoor place without the polarizer of the related art, thereby enhancing image quality.

The semi-transmissive layer543may be disposed on the light path change layer542. The semi-transmissive layer543may include, for example, MoTi or Mo. The semi-transmissive layer543may be formed of the same material as that of the reflective layer541. For example, the semi-transmissive layer543may be thinner than that of the reflective layer541. Thus, the semi-transmissive layer543may semi-transmit external light incident thereon.

The mesh metal layer540, the first bridge550, and the plurality of first and second touch electrode TE1and TE2including the mesh metal layer540may have a reflectance of, e.g., about 10% with respect to external light incident thereon when a thickness is 500 Å or more. Accordingly, using a low reflection metal layer stacking structure, an organic light-emitting display device according to an embodiment of the present disclosure may reduce or prevent reflection of external light without a polarizer, thereby reducing the manufacturing cost, reducing or preventing the loss of luminance caused by the polarizer, and enhancing image quality.

In an organic light-emitting display device according to an embodiment of the present disclosure, the touch insulation layer520and the first and second touch electrodes TE1and TE2may be directly disposed on the upper surface of the filter planarization layer430of the color filter layer400. Accordingly, in comparison with the related art organic light-emitting display device, in which a touch screen is adhered to the organic light-emitting display device by an adhesive, according to an embodiment, an adhesive process may be unnecessary. Thus, a manufacturing process may be simplified, and the manufacturing cost may be reduced.

FIG. 5is a flowchart illustrating a method of manufacturing an organic light-emitting display device according to an embodiment of the present disclosure.FIGS. 6A to 6Eare cross-sectional views taken along line I-I ofFIG. 1for describing a method of manufacturing an organic light-emitting display device according to an embodiment of the present disclosure.FIG. 7is a photograph showing a process ofFIG. 6Cand shows a cross-sectional surface of each of an encapsulation layer and a color filter layer of an organic light-emitting display device according to an embodiment of the present disclosure.

FIGS. 6A to 6Erelate to a method of manufacturing the organic light-emitting display device illustrated inFIG. 2. Thus, like reference numerals refer to like elements. Hereinafter, a method of manufacturing an organic light-emitting display device according to an embodiment of the present disclosure will be described below in detail with reference toFIGS. 5 and 6A to 6E.

In operation S101ofFIG. 5and in theFIG. 6Aexample, a TFT220, an organic light-emitting device260, an encapsulation layer300, and a black matrix410may be formed on a substrate100. For example, the TFT220may be formed on a buffer layer. The buffer layer may protect the TFT220and the organic light-emitting device260from water penetrating through the substrate100that may be vulnerable to penetration of water. The buffer layer may include a plurality of inorganic layers that may be alternately stacked. For example, the buffer layer may be formed, e.g., of a multilayer in which one or more inorganic layers, for example, of silicon oxide (SiOx), silicon nitride (SiNx), and SiON may be alternately stacked. The buffer layer may be formed, for example, using a chemical vapor deposition (CVD) process.

Subsequently, an active layer221of the TFT220may be formed on the buffer layer. In detail, an active metal layer may be formed all over the buffer layer using a sputtering process, a metal organic chemical vapor (MOCVD) process, and/or the like. Subsequently, the active layer221may be formed by patterning the active metal layer through a mask process using a photoresist pattern. The active layer221may be formed of a silicon-based semiconductor material, an oxide-based semiconductor material, and/or the like.

Subsequently, a gate insulation layer210may be formed on the active layer221. The gate insulation layer220may be formed, e.g., of an inorganic layer, for example, silicon oxide (SiOx), silicon nitride (SiNx), or a multilayer thereof.

Subsequently, a gate electrode222of the TFT220may be formed on the gate insulation layer210. For example, a first metal layer may be formed all over the gate insulation layer210, e.g., using a sputtering process, an MOCVD process, and/or the like. Subsequently, the gate electrode222may be formed, e.g., by patterning the first metal layer through a mask process using a photoresist pattern. The gate electrode222may be formed, for example, of a single layer or a multilayer, which may include one or more of: molybdenum (Mo), aluminum (Al), chromium (Cr), gold (Au), titanium (Ti), nickel (Ni), neodymium (Nd), and copper (Cu), and an alloy thereof.

Subsequently, an interlayer dielectric230may be formed on the gate electrode222. The interlayer dielectric230may be formed, e.g., of an inorganic layer, for example, SiOx, SiNx, or a multilayer thereof. Subsequently, a plurality of contact holes CT1may be formed to pass through the gate insulation layer210and the interlayer dielectric230to expose the active layer221.

Subsequently, a source electrode223and a drain electrode224of the TFT220may be formed on the interlayer dielectric230. For example, a second metal layer may be formed all over the interlayer dielectric230, e.g., using a sputtering process, an MOCVD process, and/or the like. Subsequently, the source electrode223and the drain electrode224may be formed, for example, by patterning the second metal layer through a mask process using a photoresist pattern. Each of the source electrode223and the drain electrode224may contact the active layer221through a contact hole CT1that may pass through the gate insulation layer210and the interlayer dielectric230. The source electrode223and the drain electrode224may each be formed of a single layer or a multilayer, which may include one or more of: Mo, Al, Cr, Au, Ti, Ni, Nd, and Cu, and an alloy thereof.

Subsequently, a passivation layer240may be formed on the source electrode223and the drain electrode224of the TFT220. The passivation layer240may be formed of an inorganic layer, for example, SiOx, SiNx, or a multilayer thereof. The passivation layer240may be formed, e.g., using a CVD process.

Subsequently, a pixel planarization layer250for planarizing a step height caused by the TFT220may be formed on the passivation layer240. The pixel planarization layer250may be formed of an organic layer, such as acryl resin, epoxy resin, phenolic resin, polyamide resin, polyimide resin, and/or the like.

Subsequently, a first electrode261of the organic light-emitting device260may be formed on the pixel planarization layer250. For example, a third metal layer may be formed all over the pixel planarization layer250, e.g., using a sputtering process, an MOCVD process, and/or the like. Subsequently, the first electrode261may be formed, e.g., by patterning the third metal layer through a mask process using a photoresist pattern. The first electrode261may be connected to the drain electrode224of the TFT220through a contact hole CT2that may pass through the passivation layer240and the pixel planarization layer250. The first electrode261may be formed of a conductive material, which may be high in reflectance, such as a stacked structure (Ti/Al/Ti) of Al and Ti, a stacked structure (ITO/Al/ITO) of Al and indium tin oxide (ITO), an APC alloy, a stacked structure (ITO/APC/ITO) of an APC alloy and ITO, and/or the like. Embodiments are not limited to the above examples.

Subsequently, a bank270may be formed on the pixel planarization layer250to cover an edge of the first electrode261, for dividing a plurality of pixels P. The bank270may be formed of an organic layer, such as acryl resin, epoxy resin, phenolic resin, polyamide resin, polyimide resin, and/or the like.

Subsequently, an organic light-emitting layer262may be formed on the first electrode261and the bank270in a deposition process or a solution process. The organic light-emitting layer262may be a common layer that may be formed in the pixels P in common. For example, the organic light-emitting layer262may be a white light-emitting layer that may emit white light.

If the organic light-emitting layer262is the white light-emitting layer, the organic light-emitting layer262may be formed in a tandem structure of two or more stacks. Each of the stacks may include a hole transporting layer, at least one light-emitting layer, and an electron transporting layer.

Moreover, a charge generating layer may be formed between the stacks. The charge generating layer may include an n-type charge generating layer, disposed adjacent to a lower stack, and a p-type charge generating layer that may be formed on the n-type charge generating layer and may be disposed adjacent to an upper stack. The n-type charge generating layer may inject an electron into the lower stack, and the p-type charge generating layer may inject a hole into the upper stack. The n-type charge generating layer may be formed of an organic layer which may be doped, e.g., with alkali metal, such as lithium (Li), sodium (Na), potassium (K), or cesium (Cs), or with an alkali earth metal, such as magnesium (Mg), strontium (Sr), barium (Ba), or radium (Ra). Embodiments are not limited thereto. The p-type charge generating layer may be formed by doping a dopant on an organic material having an ability to transport holes.

Subsequently, a second electrode263may be formed on the organic light-emitting layer262. The second electrode263may be a common layer that may be formed in the pixels P in common. The second electrode263may be formed of a transparent conductive material (TCO), such as ITO or IZO, capable of transmitting light, or a semi-transmissive conductive material, such as Mg, Ag, or an alloy of Mg and Ag. The second electrode263may be formed, e.g., through a physical vapor deposition (PVD) process, such as a sputtering process. A capping layer may be formed on the second electrode263.

Subsequently, an encapsulation layer300may be formed on the second electrode263. The encapsulation layer300reduces or prevents oxygen or water from penetrating into the organic light-emitting layer262and the second electrode263. To this end, the encapsulation layer300may include at least one inorganic layer and at least one organic layer.

For example, the encapsulation layer300may include a first inorganic layer301, an organic layer302, and a second inorganic layer303. For example, the first inorganic layer301may be formed to cover the second electrode263. The organic layer302may be formed to cover the first inorganic layer301. To reduce or prevent particles from penetrating into the organic light-emitting layer262and the second electrode263via the first inorganic layer301, the organic layer302may be formed to have a sufficient thickness in consideration of reducing or preventing the penetration of the particles. The second inorganic layer303may be formed to cover the organic layer302.

Each of the first and second inorganic layers301and303may be formed, for example, of one or more of: silicon nitride, aluminum nitride, zirconium nitride, titanium nitride, hafnium nitride, tantalum nitride, silicon oxide, aluminum oxide, titanium oxide, and/or the like. The organic layer302may be formed, e.g., of an organic layer, such as acryl resin, epoxy resin, phenolic resin, polyamide resin, polyimide resin, and/or the like. Subsequently, a black matrix410may be formed on the encapsulation layer300.

For example, a first matrix metal layer411, an inorganic layer412, and a second matrix metal layer413may be sequentially formed on the second inorganic layer303of the encapsulation layer300. For example, the first matrix metal layer411, the inorganic layer412, and the second matrix metal layer413may be formed all over the encapsulation layer300, e.g., using a sputtering process, an MOCVD process, and/or the like.

In operation S102ofFIG. 5and in theFIG. 6Bexample, a photoresist pattern PR may be formed on the black matrix410. The black matrix410may overlap the bank270.

In operation S103ofFIG. 5and in the examples ofFIGS. 6C and 7, a hole H may be formed in the black matrix410and the encapsulation layer300, e.g., by etching a gap between adjacent photoresist patterns PR. Foe example, a first hole H1, a second hole H2, and a third hole H3may be formed in the black matrix410and on the second inorganic layer303to correspond to the organic light-emitting layer262. A portion of the black matrix410uncovered by the photoresist pattern PR may be removed through an etching process. If the etching process is continuously performed, even after a portion of the black matrix410corresponding to a gap between adjacent photoresist patterns PR is removed, over-etching may be made. Thus, a portion of the second inorganic layer303may be removed. Therefore, the hole H may be formed to extend to a lower surface of the black matrix410.

In operation S104ofFIG. 5and in theFIG. 6Dexample, the photoresist pattern PR may be removed. Then, a color filter420may be formed in the hole H provided in the black matrix410.

For example, a first color filter421may be formed in the first hole H1, a second color filter422may be formed in the second hole H2, and a third color filter423may be formed in the third hole H3. For example, the first color filter421may be a red color filter, the second color filter422may be a green color filter, and the third color filter423may be a blue color filter. An organic material including a red pigment may be coated on the black matrix410. The first color filter421may be formed in the first hole H1, e.g., by performing a photo process.

Subsequently, an organic material including a green pigment may be coated on the black matrix410. The second color filter422may be formed in the second hole H2by performing a photo process.

Subsequently, an organic material including a blue pigment may be coated on the black matrix410. The third color filter423may be formed in the third hole H3by performing a photo process.

The color filter420may be formed to fill the hole H, and may also be formed on an upper surface of the black matrix410, but embodiments are not limited thereto. For example, the color filter420may be formed to fill only the hole H.

When the color filter420is directly formed on the organic light-emitting device260, a high temperature can affect the organic light-emitting device260. Thus, a low temperature curing color filter may be used. Because the black matrix410of an organic light-emitting display device according to an embodiment of the present disclosure may include the metal layer, deformation is not easily made. Therefore, if the color filter420is formed in the hole H provided in the black matrix410, the black matrix410may act as a frame of the color filter420. Due to a dissolution rate difference between a surface receiving much light and a bottom receiving relatively less light, the color filter may not have the reverse taper structure. Also, in an organic light-emitting display device according to an embodiment of the present disclosure, the hole H may be provided to extend the second inorganic layer303of the encapsulation layer300disposed on a lower surface of the black matrix410. Thus, when the color filter420is formed in the hole H, a lower portion of the color filter420may be hung on the lower surface of the black matrix410, e.g., in a hook shape. Accordingly, the color filter420may be disposed to contact the lower surface of the black matrix410. Thus, the color filter420may not be detached by an external force, thereby reducing or preventing the process stability and product reliability of the organic light-emitting display device from being reduced. Due to a process margin, the color filter420may be formed on an upper surface of the black matrix410to surround an end of the black matrix410.

In operation S105ofFIG. 5and in theFIG. 6Eexample, a filter planarization layer430may be formed on the black matrix410and the color filter420. The filter planarization layer430may be formed to cover the black matrix410and the color filter420for planarizing a step height caused by the color filter420. The filter planarization layer430may be formed of an organic layer, such as acryl resin, epoxy resin, phenolic resin, polyamide resin, polyimide resin, and/or the like.

A process of forming the color filter layer400illustrated in the examples ofFIGS. 6A to 6Emay be a process of forming the color filter layer400on the encapsulation layer300covering the organic light-emitting device260. Thus, the process of forming the color filter layer400may be a low temperature process which is performed at a temperature of 100° (degrees) C. or less for reducing or preventing the organic light-emitting device260from being damaged. Moreover, although it has been described above that the first color filter421is the red color filter, the second color filter422is the green color filter, and the third color filter423is the blue color filter, but embodiments are not limited thereto.

As described above, in an organic light-emitting display device according to an embodiment of the present disclosure, because the black matrix may include the metal layer, deformation is not easily made. Thus, the black matrix may act as the frame of the color filter. Accordingly, due to a dissolution rate difference between a surface receiving more light and a bottom receiving relatively less light, the color filter may not have the reverse taper structure.

Moreover, in an organic light-emitting display device according to an embodiment of the present disclosure, because the color filter may be disposed to contact the lower surface of the black matrix, the color filter may not be detached by an external force, thereby reducing or preventing the process stability and product reliability of the organic light-emitting display device from being reduced.

Moreover, in an organic light-emitting display device according to an embodiment of the present disclosure, by applying the low reflection metal layer stacked structure, reflection of external light may be reduced or prevented without a polarizer, thereby reducing the cost, reducing or preventing luminance from being reduced by the polarizer, and enhancing image quality.

In comparison with the related art organic light-emitting display device in which a touch screen is adhered to an organic light-emitting display device by an adhesive, in an organic light-emitting display device according to an embodiment of the present disclosure, because the touch insulation layer and the first and second touch electrodes may be directly disposed on the color filter layer, an adhering process may not be needed. Thus, a process may be simplified and the cost may be reduced.