KR20180071470A - Electroluminescent Display Device - Google Patents

Abstract

The present invention relates to an electroluminescent display device capable of reducing the number of channels of a touch sensor driving circuit. The electroluminescent display device includes a substrate having an active region and a bezel region disposed outside the active region; an encapsulator sealing display elements disposed in the active region of the substrate; a switching part disposed in the bezel region of the substrate; and a plurality of touch driving electrodes and a plurality of touch sensing electrodes disposed to be electrically insulated and intersect with each other on the encapsulator. The switching part sequentially supplies a touch driving signal to the plurality of touch driving electrodes.

Description

[0001] Electroluminescent Display Device [0002]

The present invention relates to an electroluminescence display device, and more particularly, to an electroluminescence display device including a touch sensor.

2. Description of the Related Art Recently, various display devices (flat display devices) capable of reducing weight and volume, which are disadvantages of cathode ray tubes (CRTs), have been developed. Such flat panel display devices include a liquid crystal display (LCD), a field emission display (FED), a plasma display panel (PDP), and an electroluminescent display device have.

Since the display device is thin and light in weight, it is widely used as a display means in a mobile communication terminal or a portable information processor. Particularly, there is a growing demand for display panels that are thinner, lighter, and have lower power consumption in portable or mobile devices. Such display devices are applied not only to mobile devices such as smart phones and tablet PCs but also to various fields such as TVs (Television), automobile displays, and wearable devices.

In general, such display devices require an interface to an input device which is convenient and simple and can reduce malfunctions. In response to such demands, a touch sensor has been proposed in which a user directly touches a screen with a hand or a pen to input information. Such a touch sensor is used in combination with a display device in various ways.

Hereinafter, an electroluminescent display device (hereinafter simply referred to as an electroluminescent display device) having a conventional touch sensor will be described with reference to Figs. 1 and 2. Fig.

1 and 2, an electroluminescent display includes a display panel (DIS) for displaying an input image, and a touch sensor (TS) disposed thereon for sensing a touch.

The display panel DIS and the touch sensor TS include an active area AA and a bezel area ZA.

The active area AA of the display panel DIS is an area in which an input image is displayed and includes a substrate SUB and display elements DE formed on the substrate SUB (e.g., a gate line, a data line, A thin film transistor, a storage capacitor, and the like), and an organic light emitting element EL formed on the display element DE.

The active area AA of the touch sensor TS is an area in which information is input through touch or proximity of an object such as a finger or a stylus pen or the like and is formed on an encapsulator ENC as a sealing substrate of the display panel DIS, Driving electrodes Tx1 to Tx4 and touch sensing electrodes Rx1 to Rx3 arranged so as to cross each other with the interelectrode INS interposed therebetween.

The bezel area BA of the display panel DIS is an area where gate lines and data lines for displaying an input image and pads for connection with power supply lines and external circuits are arranged.

The bezel area BA of the touch sensor TS includes touch driving routing lines TW1 to TW4 and touch sensing routing lines TW1 to TW4 connected to the touch driving electrodes Tx1 to Tx4 and the touch sensing electrodes Rx1 to Rx3, (RW1 to RW3) and touch driving pads TP1 to TP4 and touch sensing pads RP1 to RP3 for connection to an external circuit.

In the conventional electroluminescent display device, the number of touch driving routing wirings and the number of touch driving pads are each required to be equal to the number of touch driving electrodes, and the number of touch sensing routing wirings and the number of touch sensing electrode pads is required Do.

Therefore, as the resolution of the touch sensor increases, the number of pads increases, which increases the number of channels of the touch sensor driving circuit, thereby increasing the manufacturing cost of the entire EL display device.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an electroluminescent display device capable of reducing the number of channels of a touch sensor driving circuit.

According to an aspect of the present invention, there is provided an electroluminescent display device including: an active region; a substrate having a bezel region disposed outside the active region; An encapsulator sealing the display elements disposed in the active area of the substrate; A switching unit disposed in a bezel region of the substrate; And a plurality of touch driving electrodes and a plurality of touch sensing electrodes electrically insulated on the encapsulator and disposed to intersect with each other, and the switching unit sequentially supplies a touch driving signal to the plurality of touch driving electrodes .

In the above structure, the switching unit may include a plurality of thin film transistors sequentially supplying the touch driving signals to the plurality of touch driving electrodes.

Each of the plurality of thin film transistors includes a gate electrode controlled by a control signal supplied from a control line, a first electrode connected to each of the touch driving electrodes via a touch driving routing wiring, And a second electrode connected to a supply line for supplying the touch-driving signal.

The switching unit may include a plurality of multiplexers for sequentially supplying the touch driving signals to the plurality of touch driving electrodes.

Each of the plurality of multiplexers may supply one of a touch driving signal supplied through the touch driving signal supply wiring and a ground signal supplied through the ground wiring to the touch driving electrode.

Each of the plurality of multiplexers includes a first thin film transistor and a second thin film transistor. The first thin film transistor includes a gate electrode controlled by a first control signal, and a gate electrode electrically connected to the touch driving electrodes And a second electrode connected to the touch driving signal supply wiring for supplying the touch driving signal, wherein the second thin film transistor includes a gate electrode controlled by a second control signal, A first electrode connected to each of the touch driving electrodes through a routing wiring, and a second electrode connected to a ground wiring for supplying a ground signal.

Further, an electroluminescent display device according to the present invention includes: a plurality of touch sensing routing lines connected to the plurality of touch sensing electrodes on the encapsulator; And a touch driving signal supply wiring extending from the bezel area of the substrate to the encapsulator and supplying the touch driving signal to the switching unit.

According to the electroluminescence display device of the present invention, since the touch driving signal can be supplied to the plurality of touch driving electrodes through the switch portion, it is not necessary to form the number of touch driving pads corresponding to the plurality of touch driving electrodes . Therefore, the number of touch channels of the touch sensor driving circuit for supplying the touch driving electrode to the touch driving electrode electrodes can be reduced, thereby achieving cost reduction.

1 is a plan view of a conventional electroluminescence display device,
FIG. 2 is a schematic cross-sectional view taken along line I-I 'of FIG. 1,
3 is a plan view schematically showing an electroluminescent display device according to an embodiment of the present invention,
Fig. 4 is an equivalent circuit diagram schematically showing one pixel region of the display panel shown in Fig. 3,
Fig. 5 is a plan view schematically showing the touch sensor of Fig. 3,
6 is a schematic cross-sectional view taken along line I-I 'of Fig. 5,
FIG. 7 is a diagram showing an example in which the switching unit of FIG. 5 is composed of a multiplexer and a waveform of a touch driving signal outputted from the switching unit;

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings. Like reference numerals throughout the specification denote substantially identical components. In the following description, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear. In addition, the component names used in the following description may be selected in consideration of easiness of specification, and may be different from the parts names of actual products.

Hereinafter, an electroluminescent display according to an embodiment of the present invention will be described with reference to FIGS. 3 and 4. FIG.

FIG. 3 is a plan view schematically showing an electroluminescent display device according to an embodiment of the present invention, and FIG. 4 is an equivalent circuit diagram schematically showing one pixel region of the display panel shown in FIG.

3, an electroluminescent display device 10 according to the present invention includes display driving circuits 12, 14 and 16, a display panel DIS, a touch sensor driving circuit 15, and a touch sensor TS .

The display driving circuit includes a data driving circuit 12, a gate driving circuit 14, and a timing controller 16, and writes the video data voltage of the input image to the pixels of the display panel DIS.

The data driving circuit 12 converts the digital video data RGB input from the timing controller 16 into an analog gamma compensation voltage to generate a data voltage. The data voltage output from the data driving circuit 12 is supplied to the data lines D1 to Dm.

The gate driving circuit 14 sequentially supplies gate pulses synchronized with the data voltages to the gate lines G1 to Gn to select the pixels of the display panel DIS to which the data voltages are written.

The timing controller 16 inputs timing signals such as a vertical synchronization signal Vsync, a horizontal synchronization signal Hsync, a data enable signal DE and a main clock MCLK input from the host system 19 And synchronizes the operation timings of the data driving circuit 12, the gate driving circuit 14, and the touch sensor driving circuit 15. The data timing control signal for controlling the data driving circuit 12 includes a source sampling clock (SSC), a source output enable (SOE) signal, and the like. The gate timing control signal for controlling the gate driving circuit 14 includes a gate start pulse GSP, a gate shift clock GSC, a gate output enable signal GOE . The timing control signal for controlling the touch sensor driving circuit 15 includes a touch enable signal (TDS) and the like.

The host system 19 may be implemented as any one of a television system, a set top box, a navigation system, a DVD player, a Blu-ray player, a personal computer (PC), a home theater system, . The host system 19 includes a system on chip (SoC) with a built-in scaler to convert the digital video data RGB of the input image into a format suitable for display on the display panel DIS. The host system 19 transmits timing signals (Vsync, Hsync, DE, MCLK) to the timing controller 16 together with the digital video data.

The pixel array of the display panel DIS includes pixels defined by the data lines (D1 to Dm, m is a positive integer) and the gate lines (G1 to Gn, n is a positive integer). Each of the pixels includes an organic light emitting diode (OLED), which is a self light emitting device.

3 and 4, a plurality of data lines D, D1 to Dm and a plurality of gate lines G, G1 to Gn cross the display panel DIS, Are arranged in a matrix form. Each pixel includes an organic light emitting diode (OLED), a driving thin film transistor (hereinafter referred to as "driving TFT") DT for controlling the amount of current flowing in the organic light emitting diode OLED, a gate- And a programming portion SC for setting the source-to-source voltage.

The programming portion SC may include at least one switching TFT and at least one storage capacitor.

The switching TFT is turned on in response to a scan signal from the gate lines G, G1 to Gn, thereby applying a data voltage from the data lines D, D1 to Dm to one electrode of the storage capacitor.

The driving TFT DT controls the amount of current supplied to the organic light emitting diode OLED according to the magnitude of the voltage charged in the storage capacitor to control the amount of light emitted from the organic light emitting diode OLED. The amount of light emission of the organic light emitting diode OLED is proportional to the amount of current supplied from the driving TFT DT.

Each pixel is connected to a high potential power supply voltage source and a low potential power supply voltage source, and receives a high potential power supply voltage (EVDD) and a low potential power supply voltage (EVSS) from a power generation unit (not shown).

The TFTs constituting the pixel may be implemented as a p-type or an n-type. Further, the semiconductor layer of the TFTs constituting the pixel may include amorphous silicon, polysilicon, or an oxide. The organic light emitting diode OLED includes an anode electrode ANO, a cathode electrode CAT, and an organic light emitting layer interposed between the anode electrode ANO and the cathode electrode CAT. The anode electrode ANO is connected to the driving TFT DT. The organic light emitting layer includes an emission layer (EML), and a hole injection layer (HIL), a hole transport layer (HTL), an electron transport layer (ETL), and a light emitting layer An electron injection layer (EIL) may be disposed.

Next, a touch sensor of an electroluminescence display device according to an embodiment of the present invention will be described in more detail with reference to FIGS. 5 and 6. FIG.

5 and 6, the electroluminescence display includes a display panel (DIS) for displaying an input image and a touch sensor (TS) disposed thereon for sensing a touch.

The display panel DIS and the touch sensor TS include an active area AA and a bezel area BA.

The active area AA of the display panel DIS is an area in which an input image is displayed and includes a substrate SUB, gate lines G1 to Gn formed on the substrate SUB, data lines D1 to Dm, Display elements DE including a driving thin film transistor DT and a programming portion SC and a light emitting element layer EL formed on the display element DE and including an organic light emitting diode OLED, Is disposed. The display elements DE of the display panel DIS and the organic light emitting diode OLED are already well known and are not related to the technical structure to be solved by the present invention, and further explanation will be omitted for the sake of simplicity.

The substrate SUB of the display panel DIS may be formed of a transparent glass substrate having rigidity, but may also be formed of a transparent flexible substrate having flexibility. The flexible substrate having such flexibility may be in the form of a film including, for example, one selected from the group consisting of a polyester-based polymer, a silicone-based polymer, an acrylic polymer, a polyolefin-based polymer, and copolymers thereof. Specifically, the flexible substrate may be formed of at least one selected from the group consisting of polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polysilane, polysiloxane, polysilazane, polycarbosilane, for example, polyacrylate, polymethacrylate, polymethylacrylate, polymethylmetacrylate, polyethylacrylate, polyethylmetacrylate, cyclic olefin nose, (CO), cyclic olefin polymer (COP), polyethylene (PE), polypropylene (PP), polyimide (PI), polymethylmethacrylate (PMMA), polystyrene (PS) Polyetheretherketone (PEEK), polyester sulfone (PES), polytetrafluoroethylene (PTFE), polyvinyl chloride (PVC), polycarbonate (PC) (PVDF), may include one or perfluoroalkyl polymer (PFA), a styrene acrylic nitro rilko polymer (SAN), and selected from the group consisting of.

The bezel area BA of the display panel DIS includes gate lines G1 to Gn and data lines D1 to Dm for displaying an input image and a low potential power supply voltage EVSS and a high potential power supply voltage (Not shown) for connection with an external circuit are disposed.

A switching unit SW including a plurality of switches S1 to S4 is disposed in the bezel area BA of the display panel DIS. The switching unit SW includes a plurality of switches S1 to S4 arranged corresponding to the touch driving electrodes Tx1 to Tx4 of the touch sensor TS to be described later, And sequentially supplies the touch driving pulses Vt1 to Vt4 supplied from the touch sensor driving circuit 15 to the touch driving electrodes Tx1 to Tx4 in accordance with the control signal.

Each of the switches S1 to S4 of the switching unit SW may be formed in the form of a thin film transistor formed when the driving TFT DT of the display panel DIS is formed. For example, each of the switches S1 to S4 includes a gate electrode GE formed on the substrate SUB, a gate insulating layer GI covering the gate electrode GE, A semiconductor active layer A disposed so as to overlap the electrode GE, a first electrode E1 and a second electrode E2 spaced apart from each other on the semiconductor active layer A.

Each of the switches S1 to S4 according to the embodiment of the present invention is described as an example in which the gate electrode is composed of a gate bottom type thin film transistor disposed below the semiconductor active layer A, The present invention is not limited thereto, and the gate electrode may be a gate top type in which the gate electrode is disposed on the semiconductor active layer.

The active area AA of the touch sensor TS is an area in which information is input through touch or proximity of an object such as a finger or a stylus pen or the like and is sealed to prevent moisture penetration from the outside into the display panel DIS Driving electrodes Tx1 to Tx4 and touch sensing electrodes Rx1 to Rx3 arranged to cross each other with an insulating layer INS interposed therebetween on an encapsulator ENC as a substrate.

The touch driving electrodes Tx1 to Tx4 are arranged on the encapsulator ENC in parallel with each other in the first direction (for example, the arrangement direction of the gate lines or the arrangement direction of the data lines). Alternatively, the touch driving electrodes Tx1 to Tx4 may be arranged in parallel with each other in the first direction on the buffer layer BUF covering the encapsulator ENC over the entire surface.

The buffer layer BUF may be formed of an inorganic insulating material such as silicon oxide, silicon nitride, or an organic insulating material such as photoacryl.

Each of the touch driving electrodes Tx1 to Tx4 may include first electrode patterns Tx formed by a triangle, a square, a diamond, a polygon, a circle, an ellipse, a bar shape, And first connection patterns Tc connecting connection points Tx.

The touch sensing electrodes Rx1 to Rx3 are arranged on the insulating film INS covering the touch driving electrodes Tx1 to Tx4 in parallel with each other in a second direction intersecting the first direction. Accordingly, the touch sensing electrodes Rx1 to Rx3 are arranged to cross the touch driving electrodes Tx1 to Tx4.

Each of the touch sensing electrodes Rx1 to Rx3 includes second electrode patterns Rx formed by a triangle, a square, a diamond, a polygon, a circle, an ellipse, a bar shape, And second connection patterns Rc connecting the first connection patterns Rx

The touch driving electrodes Tx1 to Tx4 and the touch sensing electrodes Rx1 to Rx3 are formed of indium tin oxide (ITO), indium zinc oxide (IZO), gallium zinc oxide (GZO), metal nano- , Or a transparent conductive metal such as carbon-based transparent electrodes. However, when the touch driving electrodes Tx1 to Tx4 and the touch sensing electrodes Rx1 to Rx3 are formed of a transparent conductive material, although it is suitable as a touch sensor, since the RC constant value (Resistance Capacitance Constant Value) Can be reduced. In order to improve the sensitivity of the touch sensor, the touch driving electrodes Tx1 to Tx4 and the touch sensing electrodes Rx1 to Rx3 may be formed of a low resistance metal material. In this case, deterioration of the visibility of the display device due to the opacity of the metal material should be prevented. For this purpose, a metal line having a thin wiring width is formed into a mesh pattern having a specific shape such as a triangle, a square, a diamond, a polygon, a circle, an ellipse, or a bar shape, To Tx4 and touch sensing electrodes Rx1 to Rx3.

Although the touch driving electrodes Tx1 to Tx4 and the touch sensing electrodes Rx1 to Rx3 are arranged to cross each other with the insulating layer INS interposed therebetween in the above description of the embodiment, It is not.

For example, although the insulating layer INS has been described as covering the touch driving electrodes Tx1 to Tx4 as a whole, the insulating layer INS includes the touch driving electrodes Tx1 to Tx4 and the touch sensing electrodes Rx1 to Rx4, Rx3). The insulating layer INS is formed only between the first connection patterns Tc and the second connection patterns Rc of the touch driving electrodes Tx1 to Tx4 and the touch sensing electrodes Rx1 to Rx3, The first electrode patterns Tx of the touch driving electrodes Tx1 to Tx4 and the second electrode patterns Rx of the touch sensing electrodes Rx1 to Rx3 are arranged in the form of an insulating pattern, (ENC) or buffer layer (BUF).

The bezel area BA of the touch sensor TS is connected to the touch driving routing wirings TW1 to TW4, the touch sensing routing wirings RW1 to RW3, the touch driving signal supply wiring TSW, the touch driving pad TP, And the touch sensing pads RP1 to RP3 are disposed.

Each of the touch driving routing lines TW1 to TW4 includes an end connected to each of the touch driving electrodes Tx1 to Tx4 and a first electrode E1 of each of the switches S1 to S4 of the switching unit SW, As shown in Fig.

Each of the touch sensing routing wirings RW1 to RW3 has one end connected to each of the touch sensing electrodes Rx1 to Rx3 and the other end connected to each of the touch sensing pads RP1 to RP3.

The touch driving signal supply line TSW has one end connected to the second electrode E2 of the first through fourth switches S1 through S4 and the other end connected to the touch driving pad TP.

The touch driving pad TP and the touch sensing pads RP1 to RP3 are disposed at one end of the bezel area BA and connected to the touch sensor driving circuit 15 to generate a pulse supplied from the touch sensor driving circuit 15 Wave driving signals to the touch driving electrodes Tx1 to Tx4 through the touch driving routing lines TW1 to TW4.

 Next, another example of the switching unit connected to the touch sensor of the electroluminescence display device according to the embodiment of the present invention will be described with reference to FIG.

FIG. 7 is a diagram showing an example in which the switching unit of FIG. 5 is composed of a multiplexer and a waveform of a touch driving signal outputted from the switching unit.

Referring to FIG. 7, the switching unit SW of the electroluminescence display according to the embodiment of the present invention supplies a touch driving signal to the touch driving electrodes Tx1 to Tx4 of the touch sensor TS. To this end, the switching unit SW includes a plurality of switches S1 to S4 for supplying a touch driving signal to each of the touch driving electrodes Tx1 to Tx4.

Each of the plurality of switches S1 to S4 may be composed of a multiplexer. For example, the multiplexer constituting each of the plurality of switches S1 to S4 may include first thin film transistors T1a, T2a, T3a and T4a and second thin film transistors T1b, T2b, T3b and T4b. have.

The first thin film transistors T1a, T2a, T3a and T4a are connected to the first electrode connected to the touch driving routing lines TW1 to TW4 as the output lines and the first control signal lines CW1a, CW2a, CW3a and CW4a A first gate electrode supplied with first control signals C1a, C2a, C3a, and C4a, and a second electrode connected to a touch driving signal supply wiring TSW for supplying a touch driving signal.

The second thin film transistors T1b, T2b, T3b and T4b are connected to a third electrode connected to the touch driving routing lines TW1 to TW4 as an output line and through the second control signal lines CW1b, CW2b, CW3b and CW4b A second gate electrode to which the second control signals C1b, C2b, C3b, and C4b are supplied, and a third electrode that is connected to the ground wiring GW that supplies the ground signal.

The first control signals C1a, C2a, C3a and C4a and the second control signals C1b, C2b, C3b and C4b are signals having opposite polarities and are applied to the first thin film transistors T1a, T2a, T3a, and T4a and the second thin film transistors T1b, T2b, T3b, and T4b operate in opposite directions. For example, when the first thin film transistors T1a, T2a, T3a, and T4a are supplied with the first control signals C1a, C2a, C3a, and C4a and the first thin film transistors T1a, The second control signals C1b, C2b, C3b, C4b are supplied to the second thin film transistors T1b, T2b, T3b, T4b to turn on the second thin film transistors T1b, T2b, T3b, T4b The first control signals C1a, C2a, C3a, and C4a are supplied to the first thin film transistors T1a, T2a, T3a, and T4a to turn on the first thin film transistors T1a, C2b, C3b, and C4b are supplied to the second thin film transistors T1b, T2b, T3b, and T4b to turn on the second thin film transistors T1b and T2b , T3b, T4b) are turned on.

In addition, the first to fourth switches SW1 to SW4 are configured to apply the first to fourth touch driving signals Vt1 to Vt4 of the pulse wave through the first to fourth touch driving routing wirings TW1 to TW4 1 to the fourth touch driving electrodes Tx1 to Tx4.

Specifically, a first touch driving signal Vt1 of a pulse wave is supplied to the first touch driving electrode Tx1 arranged in the first row through the first switch S1 and the first touch driving routing wiring TW1 A second touch driving signal Vt2 of a pulse wave is supplied to the second touch driving electrode Tx2 disposed on the second row through the second switch S2 and the second touch driving routing line TW2 A third touch driving signal Vt3 of a pulse wave is supplied to the third touch driving electrode Tx3 disposed on the third row through the third switch S3 and the second touch driving routing wiring TW3, The fourth touch driving electrode (Tx4) is supplied with the fourth touch driving signal (Vt4) of the pulse wave through the fourth switch (S4) and the fourth touch driving routing wiring (TW4).

The first to fourth switches S1 to S4 of the switch section SW operate as follows.

When the first control signal C1a is supplied to the first transistor T1 of the first switch S1, the first transistor T1a is turned on, the second transistor T2 is turned off, The first touch driving signal Vt1 supplied through the supply wiring TSW is outputted to the first touch driving wiring TW1. At this time, the second control signals C2b, C3b and C4b are supplied to the second transistors T2b, T3b and T4b of the second to fourth switches S2 to S4 so that the second transistors T2b, T3b and T4b The first transistors T2a, T3a and T4a are turned off so that the ground signal supplied through the ground line GW is applied to the second to fourth touch driving routing lines TW2 to TW4 .

When the first control signal C1a is supplied to the first transistor T1 of the first switch S1 the first transistor T1a of the first switch S1 is turned on and the second transistor T1b is turned on, And the first touch driving signal Vt1 supplied through the touch driving signal supply wiring TSW is outputted to the first touch driving wiring TW1. At this time, the second control signals C2b, C3b and C4b are supplied to the second transistors T2b, T3b and T4b of the second to fourth switches S2 to S4 so that the second transistors T2b, T3b and T4b The first transistors T2a, T3a and T4a are turned off so that the ground signal supplied through the ground line GW is applied to the second to fourth touch driving routing lines TW2 to TW4 .

Next, when the first control signal C2a is supplied to the first transistor T2a of the second switch S2, the first transistor T2a of the second switch S2 is turned on, The second touch driving signal Vt2 is turned off and the second touch driving signal Vt2 supplied through the touch driving signal supply wiring TSW is outputted to the second touch driving wiring TW2. At this time, the second control signals C1b, C3b, and C4b are supplied to the second transistors T1b, T3b, and T4b of the first switch S1, the third switch, and the fourth switches S3 and S4, The transistors T1b, T3b and T4b are turned on and the first transistors T1a, T3a and T4a are turned off so that the ground signal supplied via the ground line GW is turned on, And output to the touch-driving routing lines TW1, TW3, and TW4.

Next, when the first control signal C3a is supplied to the first transistor T3a of the third switch S3, the first transistor T3a of the third switch S3 is turned on, And the third touch driving signal Vt3 supplied through the touch driving signal supply wiring TSW is outputted to the third touch driving wiring TW3. At this time, the second control signals C1b, C2b, and C4b are supplied to the second transistors T1b, T2b, and T4b of the first, second, and fourth switches S1, S2, T2b and T4b are turned on and the first transistors T1a, T2a and T4a are turned off so that the ground signal supplied via the ground line GW is applied to the first, And output to the wirings TW1, TW2, and TW4.

Next, when the first control signal C4a is supplied to the first transistor T4a of the fourth switch S4, the first transistor T4a of the fourth switch S4 is turned on, The fourth touch driving signal line T4b is turned off and the fourth touch driving signal Vt4 supplied through the touch driving signal supply line TSW is outputted to the fourth touch driving routing line TW4. At this time, the second control signals C1b, C2b, and C3b are supplied to the second transistors T1b, T2b, and T3b of the first, second, and third switches S1, S2, T2b and T3b are turned on and the first transistors T1a, T2a and T3a are turned off so that a ground signal supplied via the ground line GW is applied to the first, second and third touch- And output to the wirings TW1, TW2, and TW3.

Accordingly, the first to fourth switches S1 to S4 of the switch unit SW may supply the first to fourth touch driving signals Vt1 to Vt4 to the first to fourth touch driving electrodes Tx1 to Tx4).

When the first to fourth switches S1 to S4 of the switch unit SW sequentially supply the first to fourth touch driving signals Vt1 to Vt4 to the first to fourth touch driving electrodes Tx1 to Tx4 , And the touch sensor driving circuit 15 senses the touch sensing electrodes Rx1 to Rx3. Since the mutual electrostatic capacitance value between the touch driving electrodes and the touch sensing electrodes is changed before and after performing the touch with respect to the touch sensor TS, the touch sensor driving circuit senses the touch sensing electrodes Rx1 to Rx3 The change in the touch capacitance can be detected from the obtained sensing signal, and the touch position can be recognized using a known touch algorithm.

According to the electroluminescent display device according to the embodiment of the present invention, since the touch driving signal can be supplied to the plurality of touch driving electrodes through the switch unit, the number of touch driving pads corresponding to the plurality of touch driving electrodes is formed There is no need to do so. Therefore, the number of touch channels of the touch sensor driving circuit for supplying the touch driving electrode to the touch driving electrode electrodes can be reduced, thereby achieving cost reduction.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention. For example, the number of touch driving electrode electrodes, touch sensing electrodes, and various wirings described in the embodiments of the present invention is only illustrative and not intended to affect the scope of the present invention I must understand. Therefore, the present invention should not be limited to the details described in the detailed description, but should be determined by the contents of claims.

12: Data driving circuit 14: Gate driving circuit
15: touch sensor driving circuit 16: timing controller
CW1a, CW2a, CW3a, CW4a: the first control signal line
CW1b, CW2b, CW3b, CW4b: the second control signal line
DIS: Display panel SW: Switching part
S1 to S4: Switch TSW: Touch driving signal supply wiring
Tx: first electrode pattern Tx1 to Tx4: touch driving electrode
TW1 ~ TW4: Touch drive routing wiring TP1 ~ TP4: Touch drive pad
Rx: second electrode pattern Rx1 to Rx3: touch sensing electrode
RW1 ~ RW3: Touch sensing routing wiring RP1 ~ RP3: Touch sensing pad
Vt1 to Vt4: Touch driving signal

Claims (7)

A substrate having an active region and a bezel region disposed outside the active region;
An encapsulator sealing the display elements disposed in the active area of the substrate;
A switching unit disposed in a bezel region of the substrate; And
A plurality of touch driving electrodes and a plurality of touch sensing electrodes electrically insulated on the encapsulator and arranged to cross each other,
And the switching unit sequentially supplies a touch driving signal to the plurality of touch driving electrodes. The method according to claim 1,
And the switching unit includes a plurality of thin film transistors sequentially supplying the touch driving signals to the plurality of touch driving electrodes. 3. The method of claim 2,
Each of the plurality of thin film transistors includes a gate electrode controlled by a control signal supplied from a control line, a first electrode connected to each of the touch driving electrodes through a touch driving routing wiring, And a second electrode connected to the touch driving signal supply wiring. The method according to claim 1,
And the switching unit includes a plurality of multiplexers for sequentially supplying the touch driving signals to the plurality of touch driving electrodes. 5. The method of claim 4,
Wherein each of the plurality of multiplexers supplies one of a touch driving signal supplied through a touch driving signal supply wiring and a ground signal supplied through a ground wiring to the touch driving electrode. 5. The method of claim 4,
Each of the plurality of multiplexers including first and second thin film transistors,
The first thin film transistor includes a gate electrode controlled by a first control signal, a first electrode connected to each of the touch driving electrodes through a touch driving routing wiring, And a second electrode connected to the second electrode,
The second thin film transistor includes a gate electrode controlled by a second control signal, a first electrode connected to each of the touch driving electrodes via a touch driving routing wiring, a second electrode connected to a ground wiring for supplying a ground signal, And an electrode. The method according to any one of claims 1, 2, and 4,
A plurality of touch sensing routing wires connected to the plurality of touch sensing electrodes on the encapsulator; And
And a touch driving signal supply line extending from the bezel area of the substrate to the encapsulator and supplying the touch driving signal to the switching unit.

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