KR102522537B1 - Display device - Google Patents

Abstract

The present invention relates to a display device that can be reduced in thickness and weight, and the present invention relates to a light emitting element disposed on a substrate; A first inorganic encapsulation layer on the light emitting element, a first inorganic encapsulation layer on the first inorganic encapsulation layer, and an organic encapsulation layer disposed between the first inorganic encapsulation layer and the second inorganic encapsulation layer. Encapsulation to do; a plurality of touch electrodes disposed on the second inorganic encapsulation layer; and a routing line disposed on the second inorganic encapsulation layer and connected to the touch electrodes, wherein the routing line disposed on the second inorganic encapsulation layer extends to cover a side surface of the second inorganic encapsulation layer. are placed in

Description

Display device {DISPLAY DEVICE}

The present invention relates to a display device, and more particularly, to a display device having a touch sensor capable of simplifying processes and reducing costs.

A touch screen is an input device that allows a user to input a command by selecting instructions displayed on a screen such as a display device with a human hand or an object. That is, the touch screen converts a contact position directly contacted by a person's hand or an object into an electrical signal, and an instruction selected at the contact position is accepted as an input signal. Since such a touch screen can replace a separate input device connected to a display device and operated, such as a keyboard and a mouse, the use range is gradually expanding.

Such a touch screen is generally attached to the front surface of a display panel such as a liquid crystal display panel or an organic light emitting display panel through an adhesive. In this case, since the touch screen is manufactured separately and attached to the front surface of the display panel, the process becomes complicated due to the addition of the attachment process and the cost increases.

The present invention is to solve the above problems, and the present invention provides a display device capable of simplifying processes and reducing costs.

In order to achieve the above object, an organic light emitting display device according to the present invention includes a light emitting element disposed on a substrate, a first inorganic encapsulation layer on the light emitting element, and a first inorganic encapsulation layer on the first inorganic encapsulation layer. and an encapsulation unit including an organic encapsulation layer disposed between the first inorganic encapsulation layer and the second inorganic encapsulation layer, a plurality of touch electrodes disposed on the second inorganic encapsulation layer, and the second inorganic encapsulation layer. and a routing line disposed on the touch electrode and connected to the touch electrodes, and the routing line disposed on the second inorganic encapsulation layer extends and covers a side surface of the second inorganic encapsulation layer.

In the organic light emitting diode display having a touch sensor according to the present invention, touch electrodes are directly disposed on the encapsulation portion. Accordingly, compared to the conventional organic light emitting display device in which the touch screen is bonded to the organic light emitting display device through an adhesive, the present invention eliminates the need for an bonding process, thereby simplifying the process and reducing costs. Also, in the organic light emitting display device having a touch sensor according to the present invention, a color filter is directly disposed on the encapsulation portion. Accordingly, in the present invention, the bonding process is unnecessary, the process is simplified, cost can be reduced, foldability is facilitated, and high resolution and aperture ratio are increased.

1 is a perspective view illustrating an organic light emitting display device having a touch sensor according to a first embodiment of the present invention.
FIG. 2 is a plan view illustrating an organic light emitting display device having a touch sensor shown in FIG. 1 .
FIG. 3 is a cross-sectional view illustrating an organic light emitting display device having a touch sensor taken along lines “I-I'” and “II-II'” in FIG. 1 .
4 is a cross-sectional view illustrating an organic light emitting display device having a touch sensor according to a second embodiment of the present invention.
5 is a cross-sectional view illustrating an organic light emitting display device having a touch sensor according to a third embodiment of the present invention.
6 is a cross-sectional view illustrating an organic light emitting display device having a touch sensor according to a fourth embodiment of the present invention.
7 is a cross-sectional view illustrating an organic light emitting display device having a touch sensor according to a fifth embodiment of the present invention.
8A to 8D are cross-sectional views illustrating a method of manufacturing the organic light emitting diode display shown in FIG. 4 .
9 is a plan view and a cross-sectional view illustrating another embodiment of touch electrodes and bridges according to the present invention.

Hereinafter, embodiments according to the present invention will be described in detail with reference to the accompanying drawings.

1 and 2 are a perspective view and a plan view illustrating an organic light emitting display device having a touch sensor according to the present invention.

The organic light emitting display device having the touch sensor shown in FIGS. 1 and 2 detects a change in mutual capacitance (Cm) caused by a user's touch through the touch electrodes 152e and 154e during the touch period, and then touches the touch electrode. It detects presence and touch location. Also, an organic light emitting display device having a touch sensor displays an image through a unit pixel including the light emitting element 120 during a display period. A unit pixel is composed of red (R), green (G), and blue (B) sub-pixels (PXL), or red (R), green (G), blue (B), and white (W) sub-pixels (PXL). consists of

To this end, the organic light emitting diode display shown in FIG. 1 includes a plurality of sub-pixels PXL arranged in a matrix form on a substrate 111 and an encapsulation unit 140 disposed on the plurality of sub-pixels PXL. ), a mutual capacitance (Cm) and a color filter 192 disposed above the encapsulation part 140 .

Each of the plurality of sub-pixels PXL includes a pixel driving circuit and a light emitting element 120 connected to the pixel driving circuit.

The pixel driving circuit includes a switching transistor T1, a driving transistor T2 and a storage capacitor Cst.

The switching transistor T1 is turned on when a scan pulse is supplied to the scan line SL, and supplies the data signal supplied to the data line DL to the storage capacitor Cst and the gate electrode of the driving transistor T2.

The driving transistor T2 controls the current I supplied from the high potential power supply (VDD) line to the light emitting element 120 in response to a data signal supplied to the gate electrode of the driving transistor T2, thereby controlling the light emitting element 120. ) to adjust the amount of light emitted. And, even if the switching transistor T1 is turned off, the driving transistor T2 supplies a constant current I until the data signal of the next frame is supplied by the voltage charged in the storage capacitor Cst to the light emitting element ( 120) to maintain light emission.

As shown in FIG. 3, the driving thin film transistors T2 and 130 include a semiconductor layer 134 overlapping the gate electrode 132 with the gate electrode 132 and the gate insulating film 112 interposed therebetween, and a protective film ( 114 and has source and drain electrodes 136 and 138 in contact with the semiconductor layer 134 .

The light emitting element 120 includes an anode electrode 122 , at least one light emitting stack 124 formed on the anode electrode 122 , and a cathode electrode 126 formed on the light emitting stack 124 .

The anode electrode 122 is electrically connected to the drain electrode 138 of the driving thin film transistor 130 exposed through the pixel contact hole penetrating the planarization layer 116 . The light emitting stack 124 is formed on the anode electrode 122 of the light emitting region provided by the bank 128 . Each of the at least one light emitting stack 124 is formed by stacking a hole related layer, an organic light emitting layer, and an electron related layer in the order or reverse order on the anode electrode 122, and generates white light incident on the color filter 192. For example, the light emitting stack 124 includes first and second light emitting stacks facing each other with a charge generating layer interposed therebetween. In this case, one light emitting layer of the first and second light emitting stacks generates blue light, and the other light emitting layer of the first and second light emitting stacks generates yellow-green light, so that white light is transmitted through the first and second light emitting stacks. is created The cathode electrode 126 is formed to face the anode electrode 122 with the light emitting stack 124 interposed therebetween.

The sealing portion 140 blocks external moisture or oxygen from penetrating into the light emitting element 120 that is vulnerable to external moisture or oxygen. To this end, the encapsulation unit 140 includes a plurality of inorganic encapsulation layers 142 and 146 and an organic encapsulation layer 144 disposed between the plurality of inorganic encapsulation layers 142 and 146, and the inorganic encapsulation layer 146 be placed on the top floor. At this time, the encapsulation unit 140 includes at least two inorganic encapsulation layers 142 and 146 and at least one organic encapsulation layer 144 . In the present invention, the structure of the encapsulation unit 140 in which the organic encapsulation layer 144 is disposed between the first and second inorganic encapsulation layers 142 and 146 will be described as an example.

The first inorganic encapsulation layer 142 is formed on the substrate 101 on which the cathode electrode 126 is formed so as to be closest to the light emitting element 120 . The first inorganic encapsulation layer 142 is formed of an inorganic insulating material capable of low-temperature deposition such as silicon nitride (SiNx), silicon oxide (SiOx), silicon oxynitride (SiON), or aluminum oxide (Al2O3). Accordingly, since the first inorganic encapsulation layer 142 is deposited in a low-temperature atmosphere, damage to the organic light-emitting layer of the light-emitting stack 124, which is vulnerable to a high-temperature atmosphere, can be prevented during the deposition process of the first inorganic encapsulation layer 142. .

The organic encapsulation layer 144 serves as a buffer to alleviate stress between the layers caused by bending of the organic light emitting diode display and enhances planarization performance. The organic encapsulation layer 144 is made of an organic insulating material such as acrylic resin, epoxy resin, polyimide, polyethylene, or silicon oxycarbon (SiOC).

The second inorganic encapsulation layer 146 is formed on the substrate 111 on which the organic encapsulation layer 144 is formed to cover top and side surfaces of the organic encapsulation layer 144 and the first inorganic encapsulation layer 142 , respectively. Accordingly, the second inorganic encapsulation layer 146 minimizes or blocks penetration of external moisture or oxygen into the first inorganic encapsulation layer 142 and the organic encapsulation layer 144 . The second inorganic encapsulation layer 146 is formed of an inorganic insulating material such as silicon nitride (SiNx), silicon oxide (SiOx), silicon oxynitride (SiON), or aluminum oxide (Al2O3).

A color filter 192 and a touch sensor Cm are disposed on the encapsulation part 140 .

The color filter 192 is directly disposed on the encapsulation portion 140 so as to overlap the light emitting area provided by the bank 128 . Accordingly, the white light generated by the light emitting device 120 is emitted through the color filter 192, thereby realizing a color image. Meanwhile, the color filter 192 is formed of a material that can be manufactured at a low temperature (about 100 degrees or less) to protect the light emitting stack 124 vulnerable to high temperatures.

The color filter 192 is directly disposed on the encapsulation 140 formed to cover the light emitting element 120 . In this case, since the color filter 192 and the light emitting element 120 are disposed on the same substrate 111, the present invention does not require a separate bonding process, thereby simplifying the process and reducing costs. On the other hand, since the color filter 192 and the light emitting element 120 are disposed on different substrates in a conventional organic light emitting display device, a bonding process of bonding the substrate on which the color filter 192 is formed and the substrate on which the light emitting element 120 is formed are bonded. There is a problem in that the process is complicated and the cost rises.

In addition, the organic light emitting display having a touch sensor according to the present invention in which the color filter 192 is directly disposed on the encapsulation portion 140 does not require a separate substrate on which the color filter 192 is formed, and the substrate on which the light emitting element 120 is formed. Since it is provided only, the degree of freedom in design increases and foldable becomes easy. In addition, since the present invention does not require a bonding agent, a space equal to the bonding alignment tolerance and the bonding agent thickness is secured, thereby increasing resolution and aperture ratio.

As described above, a black matrix 194 is disposed between the color filters 192 of the present invention to divide each sub-pixel area and prevent light interference and light leakage between adjacent sub-pixel areas. At this time, the black matrix 194 is formed to overlap the bank 128 between the sub-pixel areas. The black matrix 194 is formed of a high-resistance black insulating material or is formed by stacking at least two color filters among the red (R), green (G), and blue (B) color filters 192 .

A touch sensor including touch sensing lines 154 and touch driving lines 152 intersecting with touch insulating film 168 therebetween on substrate 111 on which color filters 192 and black matrix 194 are formed ( Cm) is placed. For example, the touch sensing line 154 and the touch driving line 152 are disposed on the color filter 192 .

The touch driving line 152 includes a plurality of first touch electrodes 152e and first bridges 152b electrically connecting the first touch electrodes 152e to each other.

The plurality of first touch electrodes 152e are spaced apart from each other at regular intervals along the Y direction on the color filter 192 and the black matrix 194 or on the color filter 192 . Each of the plurality of first touch electrodes 152e is electrically connected to an adjacent first touch electrode 152e through a first bridge 152b.

The first bridge 152b is disposed on the black matrix 194 and is electrically connected to the first touch electrode 152e without a separate contact hole.

The touch sensing line 154 includes a plurality of second touch electrodes 154e and second bridges 154b electrically connecting the plurality of second touch electrodes 154e to each other.

The plurality of second touch electrodes 154e are spaced apart from each other at regular intervals along the X direction on the color filter 192 and the black matrix 194 or on the color filter 192 . Each of the plurality of second touch electrodes 154e is electrically connected to an adjacent second touch electrode 154e through a second bridge 154b.

The second bridge 154b is formed on the touch insulating layer 168 and is electrically connected to the second touch electrode 154e exposed through the touch contact hole 150 penetrating the touch insulating layer 168 . Like the first bridge 152b, the second bridge 154b is arranged to overlap the bank 128, so that the aperture ratio can be prevented from being damaged by the first and second bridges 152b and 154b.

As such, the touch sensing lines 154 cross each other with the touch driving line 152 and the touch insulating film 168 interposed therebetween, so that the touch sensing line 154 and the touch driving line 152 cross each other with mutual capacitance. (mutual capacitance) (Cm) is formed. Accordingly, the mutual capacitance Cm functions as a touch sensor by charging electric charges by the touch driving pulse supplied to the touch driving line 152 and discharging the charged electric charges to the touch sensing line 154 .

Meanwhile, each of the touch driving line 152 and the touch sensing line 154 of the present invention is connected to a touch driver (not shown) through the routing line 156 and the touch pad 170 .

Accordingly, the routing line 156 transmits the touch driving pulse generated by the touch driver to the touch driving line 152 through the touch pad 170, and transmits a touch signal from the touch sensing line 154 to the touch pad 170. ) is sent to The routing line 156 is disposed between each of the first and second touch electrodes 152e and 154e and the touch pad 170, and is connected to each of the first and second touch electrodes 152e and 154e without a separate contact hole. electrically connected

As shown in FIG. 2 , the routing line 156 connected to the first touch electrode 152e extends to at least one of the upper and lower sides of the active area and is connected to the touch pad 170 . The routing line 156 connected to the second touch electrode 154e extends to at least one of the left and right sides of the active area and is connected to the touch pad 170 . Meanwhile, the arrangement of the routing line 156 is not limited to the structure of FIG. 2 and can be variously changed according to the design of the display device.

The routing line 156 is formed in a single-layer or multi-layer structure using a first conductive layer such as Al, Ti, Cu, or Mo, which has strong corrosion resistance and acid resistance and good conductivity. For example, the routing line is formed of a stacked three-layer structure such as Ti/Al/Ti or Mo/Al/Mo, or a transparent conductive layer such as ITO or IZO having strong corrosion resistance and acid resistance, and Ti/Al having good conductivity. It is formed as a multilayer structure including an opaque conductive layer such as /Ti or Mo/Al/Mo.

The touch pad 170 includes a pad electrode 172 and a pad cover electrode 174 disposed on the pad electrode 172 to cover the pad electrode 172 .

The pad electrode 172 is formed by extending from the routing line 156 and is formed of the same material as the routing line 156 . The pad cover electrode 174 is formed of the same material as the second bridge 154b and is disposed to cover the pad electrode 172 exposed by the touch insulating layer 158 . The pad cover electrode 174 is formed to be exposed by the touch barrier film 176 and is connected to the signal transmission film on which the touch driver is mounted. Here, the touch barrier film 176 is formed to cover the touch sensing line 154 and the touch driving line 152 so that not only the touch sensing line 154 and the touch driving line 152 but also the light emitting element 120 is exposed to the outside. Prevent damage from moisture, etc. The touch barrier film 176 is formed by coating an inorganic insulating film on an organic insulating film. An optical film 178 such as a circular polarizer or an OLED Transmittance Controllable Film (OTF) may be disposed on the touch barrier film 176 .

As such, in the organic light emitting diode display having a touch sensor according to the first embodiment of the present invention, the touch electrodes 152e and 154e are directly disposed on the encapsulation portion 140 . Accordingly, compared to the conventional organic light emitting display device in which the touch screen is bonded to the organic light emitting display device through an adhesive, the present invention eliminates the need for an bonding process, thereby simplifying the process and reducing costs. In addition, in the organic light emitting display device having a touch sensor according to the present invention, the color filter 192 is directly disposed on the encapsulation portion 140 . Accordingly, in the present invention, the bonding process is unnecessary, the process is simplified, cost can be reduced, foldability is facilitated, and high resolution and aperture ratio are increased.

4 is a cross-sectional view illustrating an organic light emitting display device having a touch sensor according to a second embodiment of the present invention.

In contrast to the organic light emitting display device shown in FIG. 3 , the organic light emitting display device having the touch sensor shown in FIG. 4 has a gap between the color filter 192 and the black matrix 194 and the touch electrodes 152e and 154e. It has the same components except for additionally including the disposed touch buffer layer 166 . Accordingly, detailed descriptions of the same components will be omitted.

The touch buffer layer 166 is formed on the color filter 192 and the black matrix 194 to cover them, and on the touch buffer layer 166, the first and second touch electrodes 152e and 154e, the first A bridge 152b is formed. At this time, the touch buffer layer 166 is formed to a thickness of about 500 Å to 5 μm so that a separation distance between each of the touch sensing line 154 and the touch driving line 152 and the cathode electrode 126 is maintained at least 5 μm. . Accordingly, the capacitance value of the parasitic capacitor formed between each of the touch sensing line 154 and the touch driving line 152 and the cathode electrode 126 can be minimized, thereby minimizing the touch sensing line 154 and the touch driving line 152. ) and mutual influence due to coupling between each of the cathode electrodes 126 can be prevented. On the other hand, when the separation distance between each of the touch sensing line 154 and the touch driving line 152 and the cathode electrode 126 is less than 5 μm, each of the touch sensing line 154 and the touch driving line 152 and the cathode Touch performance is degraded due to mutual influence due to coupling between the electrodes 126 .

In addition, the touch buffer layer 166 is a layer through which a chemical solution (developer or etchant, etc.) used in the manufacturing process of the touch sensing line 154 and the touch driving line 152 or moisture from the outside permeates into the light emitting stack 124. can block it Accordingly, since the light emitting stack 124, which is vulnerable to chemicals or moisture, is protected by the touch buffer layer 166, damage to the light emitting stack 124 can be prevented.

The touch buffer layer 166 can be formed at a low temperature of 100 degrees (°C) or less and is formed of an organic insulating material having a low permittivity of 1 to 3 in order to prevent damage to the light emitting stack 124 vulnerable to high temperatures. For example, the touch buffer layer 166 is formed of an acryl-based, epoxy-based, or siloxane-based material. The touch buffer layer 166, which is made of an organic insulating material and has planarization performance, is used to prevent damage to each encapsulation layer 142, 144, and 146 in the encapsulation unit 140 due to bending of the organic light emitting display device and touch sensing formed on the touch buffer layer 166. Breaking of the line 154 and the touch driving line 152 may be prevented.

As such, in the organic light emitting diode display having a touch sensor according to the second embodiment of the present invention, the touch electrodes 152e and 154e are directly disposed on the encapsulation portion 140 . Accordingly, compared to the conventional organic light emitting display device in which the touch screen is bonded to the organic light emitting display device through an adhesive, the present invention eliminates the need for an bonding process, thereby simplifying the process and reducing costs. In addition, in the organic light emitting display device having a touch sensor according to the present invention, the color filter 192 is directly disposed on the encapsulation portion 140 . Accordingly, in the present invention, the bonding process is unnecessary, the process is simplified, cost can be reduced, foldability is facilitated, and high resolution and aperture ratio are increased. In addition, the organic light emitting diode display having a touch sensor according to the second embodiment of the present invention prevents damage to the light emitting stack 124 through the touch buffer layer 166 disposed between the color filters and the touch electrodes. In addition, the capacitance value of the parasitic capacitor formed between the cathode electrode 126 and the touch electrodes 152e and 154e can be reduced.

5 is a cross-sectional view illustrating an organic light emitting display device having a touch sensor according to a third embodiment of the present invention.

The organic light emitting display device shown in FIG. 5 has the same components as the organic light emitting display device shown in FIG. 4 except that color filters 192 are disposed on the touch electrodes 152e and 154e. . Accordingly, detailed descriptions of the same components will be omitted.

The color filter 192 and the black matrix 194 shown in FIG. 5 are disposed to cover the touch sensor. That is, the touch sensing line 154 and the touch driving line 152 included in the touch sensor are disposed between the color filter 192 and the encapsulation unit 140 . In this case, the color filter 192 and the black matrix 194 positioned above the touch sensor Cm absorb external light incident from the outside to the inside of the organic light emitting display device. That is, the touch sensor Cm, the light emitting element 120, and the thin film transistor 130 each include a conductive layer formed of a metal having a high reflectivity (eg, the bridges 152b and 154b), the anode electrode 122, and the gate. External light can be prevented from being reflected by the electrode 132 and the source and drain electrodes 136 and 138, thereby preventing deterioration in visibility due to external light. Accordingly, since the organic light emitting diode display shown in FIG. 5 can prevent deterioration in visibility due to external light without a separate circular polarizing plate, costs can be reduced by removing the circular polarizing plate.

In addition, a touch buffer layer 166 is formed on the substrate 111 on which the color filter 192 and the black matrix 194 are formed. The touch buffer layer 166 is formed of an organic insulating material such as acrylic resin, epoxy resin, polyimide, polyethylene, or silicon oxycarbon (SiOC). Since the substrate 111 on which the color filter 192 and the black matrix 194 are formed is flattened by the touch buffer film 166 formed of such an organic insulating material, the barrier film 176 attached to the touch buffer film 166 and adhesion of the optical film 178 is improved.

As such, in the organic light emitting diode display having a touch sensor according to the third embodiment of the present invention, the touch electrodes 152e and 154e are directly disposed on the encapsulation portion 140 . Accordingly, compared to the conventional organic light emitting display device in which the touch screen is bonded to the organic light emitting display device through an adhesive, the present invention eliminates the need for an bonding process, thereby simplifying the process and reducing costs. In addition, in the organic light emitting display device having a touch sensor according to the present invention, the color filter 192 is directly disposed on the encapsulation portion 140 . Accordingly, in the present invention, the bonding process is unnecessary, the process is simplified, cost can be reduced, foldability is facilitated, and high resolution and aperture ratio are increased. In addition, the organic light emitting display device having a touch sensor according to the present invention absorbs external light through the color filter 192 and the black matrix 194 disposed to cover the light emitting element 120 and the touch sensor Cm. , it is possible to prevent deterioration of visibility due to external light.

6 is a cross-sectional view illustrating an organic light emitting display device having a touch sensor according to a fourth embodiment of the present invention.

The OLED display shown in FIG. 6 has the same components as the OLED display shown in FIG. 4 except that at least one of the black matrix 194 and the color filter 192 is used as a touch insulating layer. provide Accordingly, detailed descriptions of the same components will be omitted.

The touch sensing line 154 and the touch driving line 152 of the organic light emitting diode display shown in FIG. 6 intersect with at least one of the color filter 192 and the black matrix 194 interposed therebetween. Accordingly, the first bridge 152b and the first touch electrode 152e of the touch driving line 152 and the second touch electrode 154e of the touch sensing line 154 are formed on the encapsulation layer 140, , the second bridge 154b is formed on the color filter 192 and the black matrix 194. The second bridge 154b is electrically connected to the second touch electrode 154e exposed through the touch contact hole 150 penetrating the black matrix 194 . As such, since the first and second bridges 152b and 154b are insulated through the black matrix 194 without a separate touch insulating film, thinning is possible, and the manufacturing process of the touch insulating film can be omitted, simplifying the process and reducing costs. savings can be made

Meanwhile, in FIG. 6 , the touch contact hole 140 penetrates the black matrix 194 as an example, but in addition, the touch contact hole 150 penetrates the color filter 192 or penetrates the color filter 192 according to the design of the display device. , may pass through the color filter 192 and the black matrix 194.

7 is a cross-sectional view illustrating an organic light emitting display device having a touch sensor according to a fifth embodiment of the present invention.

The OLED display shown in FIG. 7 has the same components as the OLED display shown in FIG. 6 except for omitting the touch barrier film 176 and including the barrier thin film layer 160 . Accordingly, detailed descriptions of the same components will be omitted.

The barrier thin film layer 160 is formed between the uppermost layer of the encapsulation unit 140 and the touch electrodes 152e and 154e or between the light emitting element 120 and the lowermost layer of the encapsulation unit 140 . For example, the barrier thin film layer 160 is formed between the cathode electrode 126 and the first inorganic encapsulation layer 142 positioned at the lowermost layer of the encapsulation unit 140 . The barrier thin film layer 160 may be an inorganic material layer formed by atomic layer deposition (ALD), silicon nitride (SiNx), silicon oxide (SiOx), silicon oxynitride (SiON), or aluminum oxide (Al2O3). It is formed of an inorganic insulating material capable of low-temperature deposition. Accordingly, the barrier thin film layer 160 blocks external moisture or oxygen from penetrating into the light emitting device 120 that is vulnerable to external moisture or oxygen, so that a separate touch barrier film can be omitted. In addition, since the barrier thin film layer 160 is formed through a low-temperature deposition process, it is possible to prevent damage to the light emitting stack 124 that is vulnerable to a high-temperature atmosphere.

8A to 8D are cross-sectional views illustrating a method of manufacturing a touch sensor of an organic light emitting display device according to first to fifth embodiments of the present invention. Here, the structure of the second embodiment of the present invention shown in FIG. 4 will be described as an example.

Referring to FIG. 8A , a substrate 111 on which a switching transistor, a driving transistor 130, a light emitting element 120, an encapsulant 140, a black matrix 194, a color filter 192, and a touch buffer film 166 are formed. ), the routing line 156 and the pad electrode 172 are formed.

Specifically, the first conductivity is formed on the substrate 111 on which the switching transistor, the driving transistor, the light emitting element 120, the encapsulation 140, the black matrix 194, the color filter 192, and the touch buffer film 166 are formed. After the entire layer is deposited at room temperature through a deposition process using sputtering, the first conductive layer is patterned through a photolithography process and an etching process, thereby forming the routing line 156 and the pad electrode 172 . Here, the first conductive layer is formed in a single-layer or multi-layer structure using a metal having strong corrosion resistance and acid resistance, such as Al, Ti, Cu, and Mo. For example, the first conductive layer is formed in a stacked three-layer structure such as Ti/Al/Ti or Mo/Al/Mo.

Referring to FIG. 8B , first and second touch electrodes 152e and 154e and a first bridge 152b are formed on the substrate 111 on which the routing line 156 and the pad electrode 172 are formed.

Specifically, a second conductive layer is deposited on the entire surface of the substrate 111 on which the routing line 156 and the pad electrode 172 are formed. Here, when a transparent conductive layer such as ITO or IZO is used as the second conductive layer, the transparent conductive layer is formed at room temperature by a deposition method such as sputtering. Then, the second conductive layer is patterned through a photolithography process and an etching process, thereby forming the first and second touch electrodes 152e and 154e and the first bridge 152b.

Referring to FIG. 8C , a touch insulating layer 158 having a touch contact hole 150 is formed on the substrate 111 on which the first and second touch electrodes 152e and 154e and the first bridge 152b are formed.

Specifically, a touch insulating film 158 having a thickness of 500 Å to 5 μm is formed on the substrate 111 on which the first and second touch electrodes 152e and 154e and the first bridge 152b are formed through a deposition or coating process. . Here, when an organic film is used as the touch insulating film 158, the touch insulating film 158 is formed by coating the organic film on the substrate and then curing it at a temperature of 100 degrees or less. When an inorganic film is used as the touch insulating film 158, the touch insulating film 158 having a multilayer structure is formed by repeating the low-temperature CVD deposition process and the cleaning process at least twice. Then, the touch contact hole 150 is formed by patterning the touch insulating layer 158 through a photolithography process and an etching process.

Referring to FIG. 8D , the second bridge 154b and the pad cover electrode 174 are formed on the substrate 111 on which the touch insulating film 158 having the touch contact hole 150 is formed.

Specifically, a third conductive layer is formed on the substrate 111 on which the touch insulating film 158 having the touch contact hole 150 is formed. Here, when a transparent conductive layer such as ITO or IZO or a metal having strong corrosion resistance and acid resistance such as Al, Ti, Cu, and Mo is used as the third conductive layer, the third conductive layer is deposited at room temperature by a deposition method such as sputtering at room temperature. is formed by Then, the third conductive layer is patterned through a photolithography process and an etching process, thereby forming the second bridge 154b and the pad cover electrode 174 . Then, the touch barrier film 176 and the optical film 178 are attached to the substrate 111 on which the second bridge 154b and the pad cover electrode 174 are formed.

9 is a plan view and a cross-sectional view illustrating an organic light emitting display device having a touch sensor according to a sixth embodiment of the present invention.

The organic light emitting display device shown in FIG. 9 has the same components as the organic light emitting display device shown in FIGS. 3 to 7 except for the configuration of the first and second touch electrodes 152e and 154e being different. do. Accordingly, detailed descriptions of the same components will be described.

The first and second touch electrodes 152e and 154e shown in FIG. 9 may be formed in a mesh shape. That is, the first and second touch electrodes 152e and 154e are made of a transparent conductive layer 1541 and a mesh metal layer 1542 formed in a mesh shape above or below the transparent conductive layer 1541 . The mesh metal film 1542 is formed of the same material as the routing line 156 through the same mask process as the routing line 156 . Accordingly, it is possible to prevent a manufacturing process from being complicated and cost increased due to the mesh metal film 1542 .

In addition, the touch electrodes 152e and 154e may be formed of only the mesh metal film 1542 without the transparent conductive film 1541, or the transparent conductive film 1541 may be formed in a mesh shape without the mesh metal film 1542. Here, the mesh metal film 1542 has better conductivity than the transparent conductive film 1541, so that the touch electrodes 152e and 154e can be formed as low-resistance electrodes. In particular, when the transparent conductive layer 1541 is formed at a low temperature (about 100 degrees or less) to protect the light emitting stack 124 vulnerable to high temperatures, it is difficult to obtain high transparency and low resistance characteristics of the transparent conductive layer 1541 . In this case, the transmittance may be increased by forming the transparent conductive layer 1541 thin while reducing the resistance characteristics of the touch electrodes 152e and 154e through the mesh metal layer 1542 having good conductivity.

Accordingly, since the resistance and capacitance of the touch electrodes 152e and 154e are reduced, the RC time constant is reduced, thereby improving touch sensitivity. In addition, since the line width of the mesh metal film 1542 is very thin, reduction in aperture ratio and transmittance due to the mesh metal film 1542 can be prevented.

In addition, the bridge 154b disposed on a different plane from the touch electrodes 152e and 154e includes a plurality of slits 151 as shown in FIG. 9 . Accordingly, the area of the bridge 154b having the plurality of slits 151 may be reduced compared to a bridge having no slits 151 . Accordingly, it is possible to reduce reflection of external light by the bridge 154b, thereby preventing deterioration in visibility. The bridge 154b having the slit 151 is formed of a transparent conductive film or an opaque conductive film. When the bridge 154b is formed of an opaque conductive film, the bridge 154b overlaps the bank 128, thereby preventing an aperture ratio from being lowered.

In addition, in the organic light emitting display device having a touch sensor according to the present invention, the bridge 152b of the touch driving line 152 and the first touch electrode 152e are disposed on different planes to form a touch contact hole 150 Although it has been described as an example that the bridge 154b of the touch sensing line 154 and the second touch electrode 154e are disposed on different planes, as shown in FIG. 9 , the touch contact hole 150 ) may be connected. In this case, the manufacturing method of the touch sensor of the organic light emitting diode display shown in FIG. 9 is as follows. The second bridge 154b is formed through the first mask process, the touch insulating film having the touch contact hole 150 is formed through the second mask process, the routing line and the mesh metal film are formed through the third mask process, and the fourth mask process forms the second bridge 154b. The first bridge 152b and the first and second touch electrodes 152e and 154e are formed through the mask process.

The above description is merely illustrative of the present invention, and various modifications may be made by those skilled in the art without departing from the technical spirit of the present invention. Therefore, the embodiments disclosed in the specification of the present invention are not intended to limit the present invention. The scope of the present invention should be construed by the claims below, and all techniques within the scope equivalent thereto should be construed as being included in the scope of the present invention.

142, 144: inorganic encapsulation layer 146: organic encapsulation layer
152: touch driving line 154: touch sensing line
192: color filter 194: black matrix

Claims (18)

a light emitting device disposed on a substrate;
an encapsulation portion on the light emitting element;
a plurality of touch electrodes disposed on the encapsulation portion;
A routing line disposed on the encapsulation portion and connected to the plurality of touch electrodes:
a color filter disposed on the plurality of touch electrodes; and
A touch pad disposed on the substrate and connected to the routing line;
The routing line is formed along the side of the encapsulation part,
The plurality of touch electrodes
a plurality of lower touch electrodes disposed on the encapsulation portion;
An upper touch electrode overlapping some of the plurality of lower touch electrodes;
Upper and side surfaces of the upper touch electrode are covered by a black matrix. According to claim 1,
The display device further includes a touch insulating layer between the upper touch electrode and the lower touch electrode. According to claim 1,
An edge of the black matrix is covered by the color filter. According to claim 1,
The plurality of lower touch electrodes include adjacent first touch electrodes arranged in a first direction and second touch electrodes spaced apart from the first touch electrodes and arranged in a second direction crossing the first direction. do,
The upper touch electrode overlaps the second touch electrode between the first touch electrodes. According to claim 4,
The upper touch electrode overlaps edges of the first touch electrodes on both sides adjacent to the overlapping second touch electrodes. According to claim 5,
The upper touch electrode is connected to the first touch electrode at an overlapping portion. According to claim 1,
The touch pad has a structure in which a plurality of pad layers are stacked. According to claim 1,
A display device further comprising a touch buffer layer disposed on the color filter. According to claim 4,
At least one of the first touch electrode and the second touch electrode includes a mesh-shaped conductive film having an opening. According to claim 9,
The mesh-shaped conductive film overlaps a bank forming a light emitting region of the light emitting element. According to claim 10,
The display device of claim 1 , wherein the opening overlaps the light emitting region. According to claim 11,
The mesh-shaped conductive layer is disposed along the bank. According to claim 1,
At least one of the plurality of pad layers is formed of the same material on the same layer as at least one of the lower touch electrode and the upper touch electrode. According to claim 1,
The total number of routing lines extending from the left and right sides of the display device to the touch pad is
A display device equal to the total number of routing lines extending from upper and lower sides of the display device to the touch pad. According to claim 1,
Further comprising a thin film transistor connected to the light emitting element,
The thin film transistor is
a gate electrode disposed on the substrate;
an active layer disposed above or below the gate electrode;
a source electrode connected to the active layer;
A display device comprising a drain electrode connected to the active layer. According to claim 15,
The display device of claim 1 , wherein the routing line and the touch pad disposed on an outer portion of the substrate are disposed on one insulating layer among a plurality of insulating layers disposed between the light emitting element and the substrate. 17. The method of claim 16,
The plurality of insulating films are
a gate insulating layer disposed on the gate electrode and the active layer of the thin film transistor;
a passivation layer disposed between the source and drain electrodes of the thin film transistor and the active layer;
A display device comprising a planarization layer disposed on the source and drain electrodes. According to claim 1,
A vertical distance between the substrate and the routing line is shorter than a vertical distance between the substrate and the touch electrodes.

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