KR20170033485A - Organic Light Emitting Diode Comprising Touch Screen Panel And Driving Method Of The Same - Google Patents

Abstract

The present invention is capable of improving a touch sensitivity degradation problem by electrically disconnecting a cathode electrode and a low potential voltage source during a touch sensor driving period. To this end, the organic light-emitting diode display device according to the present invention includes: a display panel; a touch screen panel; a timing controller; a sensor driving circuit; a display driving circuit; and a switching unit. The display panel has a pixel array. The touch screen panel has a touch sensor array. The timing controller performs time division on one frame into the touch sensor driving period for sensing a touch input and a display driving period for displaying an input image based on a touch enable signal. The sensor drive circuit drives mutual capacitance sensors during the touch sensor drive period. The display driving circuit drives pixels of the display panel during the display driving period. The switching unit connects the low potential voltage source to the cathode electrode of the pixels during the display driving period, and blocks the connection between the cathode electrode of the pixels and the low potential voltage source during the touch sensor driving period.

Description

[0001] The present invention relates to an organic light emitting diode (OLED) display device including a touch screen panel,

The present invention relates to an organic light emitting diode display including a touch screen panel and a driving method thereof.

In recent years, display devices such as liquid crystal displays (LCDs), electroluminescent displays, and plasma display panels have attracted attention because of their high response speed, low power consumption, and excellent color recall . Such display devices have been used in various electronic products such as televisions, computer monitors, notebook computers, mobile phones, display parts of refrigerators, personal digital assistants, and automated teller machines. Generally, these display devices constitute an interface with a user by using various input devices such as a keyboard, a mouse, and a digitizer. However, the use of a separate input device such as a keyboard and a mouse has been required to learn how to use the device and to inconvenience such as occupying a space, thereby making it difficult to improve the completeness of the product. Therefore, there is a growing demand for an input device that is convenient and simple and can reduce malfunctions. In accordance with such a demand, a touch screen panel has been proposed in which a user directly touches the screen with a hand or a pen to input information.

The touch screen panel is simple, has little malfunction, can be input without using a separate input device, and can be operated quickly and easily through the contents displayed on the screen. .

The touch screen panel includes a resistive type in which a metallic electrode is formed on a top plate or a bottom plate in accordance with a method of detecting a touched portion to determine a touched position as a voltage gradient according to a resistance in a state in which a direct current voltage is applied, A capacitive type in which an equipotential is formed on a conductive film and a touched portion is sensed by sensing a position where a voltage change of the upper and lower plates due to a touch is sensed and an LC value derived by touching the conductive film is read An electro-magnetic type in which a touch portion is sensed, and the like.

The capacitive touch screen panel may be formed as an add-on type, an on-cell type, or an integrated type according to its structure. In the top plate attaching type, a touch sensor is attached to an upper plate of a display device after separately manufacturing a display device and a touch sensor. The top plate integral type is a method of directly forming elements constituting the touch sensor on the surface of the upper substrate of the display device. The built-in type has a built-in touch sensor inside the display device to achieve a thin display device and enhance durability.

Hereinafter, an organic light emitting diode display device including a conventional touch screen panel will be described with reference to FIGS. 1 and 2. FIG. FIG. 1 and FIG. 2 are cross-sectional views for explaining problems of an organic light emitting diode display device including a touch screen panel according to a related art.

The organic light emitting diode display device according to the related art includes a display panel including an organic light emitting diode, which is a self light emitting device, and a touch screen panel including a mutual capacitance sensor.

The display panel includes an organic light emitting diode and a thin film transistor array for driving the organic light emitting diode. The organic light emitting diode includes an anode electrode connected to the driving thin film transistor, a cathode electrode 5 connected to the low potential voltage source (VSS) to receive the ground voltage, and an organic compound layer interposed between the anode electrode and the cathode electrode 5 do.

On the cathode electrode 5, a touch screen panel for sensing a touch input or a gesture is disposed. Touch sensors are arranged on the touch screen panel. The touch sensors are driven by mutual capacitance sensors. The mutual capacitance sensor includes mutual capacitance formed between the two electrodes 3, 4. The mutual capacitance sensing circuit applies a driving signal (or a stimulus signal) to the driving electrode 3 and senses the touch input based on the amount of charge change of the mutual capacitance sensed through the sensing electrode 4. As the conductors approach the mutual capacitance, the amount of charge in the mutual capacitance is reduced and the touch input can be sensed. The driving electrode 3 and the sensing electrode 4 are arranged on the base film 1 so as to cross each other.

Recently, due to the development of technology, display devices have become smaller and thinner. Accordingly, the sensors of the touch screen panel are disposed very close to the cathode electrode 5 of the display panel. This is especially true when the touch screen panel is implemented as an embedded type. As described above, when the sensors of the touch screen panel are positioned close to the cathode electrode 5, the following problems arise.

First, the parasitic capacitance is increased due to the adjacent arrangement of the driving electrode 3, the sensing electrode 4, and the cathode electrode 5. In general, the sensitivity of the touch sensing improves as the time constancy decreases. Since the size of the time constant is proportional to the magnitude of the parasitic capacitance and the resistance value, it is necessary to reduce the influence of the parasitic capacitance .

2, most of the charges moving between the driving electrode 3 and the sensing electrode 4 due to the adjacent arrangement of the driving electrode 3, the sensing electrode 4, and the cathode electrode 5, And is lost to the electrode (5). That is, most of the charges flow out from the driving electrode 3 to the sensing electrode 4 to the cathode electrode 5 connected to the low potential voltage source Vss, making it impossible to properly detect the amount of charge change before and after the touch .

In order to solve such a problem, Korean Laid-Open Publication No. 10-2013-0009520 discloses a structure including a conductive pattern layer between a touch screen panel and a cathode electrode. Referring to FIG. 3, a conductive pattern layer is disposed between the touch electrodes 3 and 4 and the cathode electrode 5 to prevent charges from being lost to the cathode electrode 5. By providing the conductive pattern layer 7, a charge loss can be prevented to a certain extent, but a considerable part of the moving charges are lost to the cathode electrode 5. Further, another additional process is required to form the conductive pattern layer. The addition of the process causes a problem of yield reduction, and can increase manufacturing cost and manufacturing time.

The present invention provides an organic light emitting diode (OLED) display device in which a common electrode and a low potential voltage source are electrically disconnected during a touch sensor driving period, thereby improving a touch sensitivity lowering problem.

In order to achieve the above object, the present invention includes a switching unit for connecting a low potential voltage source to the common electrode of the pixels during the display driving period and for interrupting the connection between the common electrode and the low potential potential source of the pixels during the touch sensor driving period.

Each frame is time-divided into a touch sensor driving period and a display driving period based on a touch enable signal.

The preferred embodiment of the present invention can prevent the touch sensitivity from being lowered by the parasitic capacitance formed between the touch electrodes and the cathode electrode by floating the cathode electrode during the touch sensor driving period.

The preferred embodiment of the present invention can prevent the charge to be transferred from the first electrode to the second electrode to the cathode electrode during the touch sensor driving period. Accordingly, it is possible to provide an organic light emitting diode display device having a touch sensor with improved mutual electrostatic capacitance and improved touch sensitivity.

According to a preferred embodiment of the present invention, the floating cathode electrode may function as a charge transfer layer of charge moving from the first electrode to the second electrode. That is, the preferred embodiment of the present invention can improve the charge transfer force of charges moving from the first electrode to the second electrode by floating the cathode electrode having a large area during the touch sensor driving period.

According to the preferred embodiment of the present invention, the cathode electrode floating during the touch sensor driving period functions as a barrier to block noise from the display panel.

FIGS. 1 and 2 are cross-sectional views illustrating an organic light emitting diode display device including a touch screen panel according to a related art.
FIG. 3 is a schematic view of an organic light emitting diode display device having a touch screen panel according to the present invention.
4 is a view showing an example of a touch screen panel in which mutual capacitance sensors are arranged.
5 is a diagram showing that one frame is time-divided into a display driving period and a touch sensor driving period.
6 is a schematic view illustrating one pixel included in the organic light emitting diode display according to the present invention.
7 is a cross-sectional view schematically showing an organic light emitting diode display device according to a preferred embodiment of the present invention.
8 to 10 are cross-sectional views illustrating examples of various laminated structures of the organic light emitting diode display device according to the present invention.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. Like reference numerals throughout the specification denote substantially identical components. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the following description, a detailed description of known technologies or configurations related to the present invention will be omitted when it is determined that the gist of the present invention may be unnecessarily obscured.

3 to 6, an organic light emitting diode display device according to a preferred embodiment of the present invention will be described. FIG. 3 is a schematic view of an organic light emitting diode display device having a touch screen panel according to the present invention. 4 is a view showing an example of a touch screen panel in which mutual capacitance sensors are arranged. 5 is a diagram showing that one frame is time-divided into a display driving period and a touch sensor driving period. 6 is a schematic view illustrating one pixel included in the organic light emitting diode display according to the present invention.

Referring to FIG. 3, the organic light emitting diode display 10 according to the present invention includes a touch screen panel TSP, a sensor driving circuit 18, a display panel DIS, and a display driving circuit.

The touch screen panel TSP may be implemented in a capacitive manner that senses touch inputs through a plurality of capacitive sensors. The touch screen panel (TSP) has a touch sensor array. The touch sensor array includes a plurality of touch sensors having mutual capacitances. Mutual capacitance may be formed between the crossing electrodes.

The touch screen panel TSP implemented by the mutual capacitive sensor Cm includes Tx electrode lines, Rx electrode lines intersecting Tx electrode lines, and intersections of Tx electrode lines and Rx electrode lines as shown in FIG. And mutual capacitance sensors Cm formed for each of the sensors. The Tx electrode lines are drive signal lines for supplying charge to the touch sensors by applying a touch screen panel drive signal to each of the capacitance sensors Cm. The Rx electrode lines are sensor wirings connected to the mutual capacitance sensors Cm to supply the charge of the touch sensors to the sensor drive circuit 18. [ In the mutual capacitance sensing method, a driving signal is applied to a Tx electrode through a Tx electrode line to supply electric charge to the mutual capacitance sensor Cm, and a mutual capacitance sensor (Rx electrode) The touch input can be detected by sensing the change in capacitance of the capacitor Cm.

The sensor driving circuit 18 senses the capacitance change amount of the touch sensor before and after the touch to judge whether or not a conductive substance such as a finger touches and its position.

The organic light emitting diode display device according to the present invention is time-division driven by a display driving period for displaying an input image and a touch sensor driving period for sensing a touch input. During the display driving period, data of the input image is written to each of the pixels. During the touch sensor driving period, the touch sensors are driven and the touch input is sensed.

The timing control signal generator in the timing controller 16 drives the display driving circuit during the display driving period and drives the sensor driving circuit 18 during the touch sensor driving period. The timing control signal generation section generates timing control signals for controlling the operation timing of the display drive circuit and the sensor drive circuit 18. [

The timing control signal generation unit generates a touch enable signal TEN defining the display driving period T1 and the touch sensor driving period T2 as shown in FIG. 5 to synchronize the display driving circuit and the sensor driving circuit. Each frame is time-divided into a touch sensor driving period and a display driving period based on the touch enable signal TEN.

The display driving circuit writes data to the pixels during the first level period of the touch enable signal TEN. The sensor driving circuit senses the touch input by driving the touch sensors during the second level period of the touch enable signal TEN. The first level of the touch enable signal TEN may be a low level, the second level may be a high level, and vice versa.

The sensor driving circuit 18 is connected to a driving power source (not shown) to receive driving power. The sensor driving circuit 18 generates a touch screen driving signal in response to the second level of the touch enable signal TEN and applies it to the touch sensors of the touch screen panel TSP.

The sensor drive circuit 18 detects the amount of charge change before and after the touch input from the touch sensor signal, compares the amount of change in the charge with the predetermined threshold value, and determines the position of the touch sensor having the charge change amount equal to or larger than the threshold value as the touch input area. The sensor drive circuit 18 calculates coordinates for each of the touch inputs and transmits touch data (TDATA (XY)) including the touch input coordinate information to the external host system 19. The sensor drive circuit 18 includes an amplifier for amplifying the charge of the touch sensor, an integrator for accumulating charge received from the touch sensor, an ADC (Analog to Digital Converter) for converting the voltage of the integrator into digital data, and an arithmetic logic unit . The arithmetic logic unit compares the touch raw data output from the ADC with a threshold value, and executes a touch recognition algorithm that determines a touch input and calculates coordinates based on the comparison result.

The pixel array of the display panel DIS includes pixels formed in the pixel region 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) as a self-luminous element.

6, a plurality of data lines D and a plurality of gate lines G are intersected with each other in the display panel DIS, and pixels are arranged in a matrix form in each of the intersection areas. Each of the pixels includes a driving thin film transistor (hereinafter referred to as TFT) DT for controlling the amount of current flowing through the OLED and the OLED, a programming portion SC for setting the gate-source voltage of the driving TFT DT, And a switching unit (SW) for connecting or disconnecting the common electrode of the pixels and the low potential voltage source (VSS) to each other.

The programming portion SC may include at least one switch TFT and at least one storage capacitor. The switch TFT is turned on in response to a scan signal from the gate line G, thereby applying a data voltage from the data line D to one electrode of the storage capacitor. The driving TFT DT controls the amount of current supplied to the OLED according to the magnitude of the voltage charged in the storage capacitor to control the amount of light emitted from the OLED. The amount of light emission of the OLED is proportional to the amount of current supplied from the driving TFT DT. These pixels are connected to a high potential power source VDD and a low potential power source VSS, and are supplied with a high potential power source and a low potential power source, respectively, from a power source not shown. The TFTs constituting the pixel may be implemented as a p-type or an n-type. In addition, the semiconductor layer of the TFTs constituting the pixel may include amorphous silicon, polysilicon, or an oxide. The OLED includes an anode electrode ANO, a cathode electrode CAT, and an organic compound layer interposed between the anode electrode ANO and the cathode electrode CAT. The anode electrode ANO is connected to the driving TFT DT.

The switching unit SW is connected between the common electrode and the low potential power source VSS and switches the current path between the low potential power source VSS and the common electrode in accordance with the touch enable signal TEN. Here, the common electrode may be implemented as a cathode electrode (CAT) of the OLED. The switching unit SW may connect or floating a low potential voltage source VSS to the cathode electrode CAT. Floating means blocking the current path between the cathode electrode (CAT) and the low potential voltage source (VSS). The switching unit SW is turned on according to the touch enable signal TEN during the display driving period T1 to electrically connect the cathode electrode CAT and the low potential voltage source VSS. The switching unit SW is turned off according to the touch enable signal TEN during the touch sensor driving period T2 to cut off the electrical connection between the cathode electrode CAT and the low potential voltage source VSS, The charge to be transferred from the first electrode Tx to the second electrode Rx into the cathode electrode CAT can be prevented as much as possible.

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 the gate pulses in synchronization 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 and the gate driving circuit 14 with each other. 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 drive circuit 14 includes a gate start pulse GSP, a gate shift clock signal, a gate output enable signal GOE, do.

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, and a phone 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 host system 19 executes an application program associated with the touch position information XY input from the sensor drive circuit 18. [

Hereinafter, an organic light emitting diode display device according to the present invention will be described in detail with reference to FIG. 7 is a cross-sectional view schematically showing an organic light emitting diode display device according to a preferred embodiment of the present invention.

The organic light emitting diode display device according to the preferred embodiment of the present invention includes a display panel (DIS) and a touch screen panel (TSP).

The display panel DIS includes a substrate SUB on which a plurality of elements are arranged. The substrate SUB may be formed of glass or a plastic material having a flexible property. For example, the substrate (SUB) may be formed of a material selected from the group consisting of polyimide (PI), polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polycarbonate (PC), polyethersulfone (PES), polyarylate, polysulfone, olefin copolymer, or the like. A pixel array including TFTs (TA) and an OLED is formed on a substrate SUB.

The display panel DIS includes pixels for reproducing the input image, and a plurality of pixels may be arranged on the substrate SUB in a matrix manner. Each pixel includes an OLED, TFTs (TA) for driving the OLED.

The TFT (TA) includes at least one switching TFT and includes a driving TFT for driving the OLED. The driving TFT serves to drive the OLED of the pixel selected by the switching TFT. The structure of the TFT may include any structure that can drive an organic light emitting diode display device such as a top gate structure, a bottom gate structure, and a double gate structure.

The OLED includes an anode electrode ANO connected to the driving TFT, an organic compound layer OLE formed on the anode electrode ANO, and a cathode electrode CAT formed on the organic compound layer OLE. The organic compound layer (OLE) includes an emission layer (EML), and may further include a common layer. The common layer may include at least one selected from the group consisting of a hole injection layer (HIL), a hole transport layer (HTL), an electron transport layer (ETL), and an electron injection layer (EIL) Or more.

The cathode electrode CAT is connected to the input terminal of the low potential voltage source VSS via the switching unit SW. The switching unit SW connects the cathode electrode CAT with the low potential voltage source VSS during the display driving period T1. During the display driving period T1, the cathode electrode CAT is connected to the low potential voltage source VSS and is supplied with the ground voltage. The switching unit SW electrically disconnects the cathode electrode CAT and the low potential voltage source VSS during the touch sensor driving period T2.

A touch screen panel (TSP) for sensing a touch input or a gesture is disposed on the cathode electrode (CAT). Sensors are arranged in the touch screen panel (TSP). The sensors are driven by mutual capacitive sensors. The mutual capacitance sensor includes a mutual capacitance Cm formed between the two electrodes Tx and Rx. The sensor driving circuit applies a driving signal (or a stimulus signal) to one of the two electrodes (hereinafter, referred to as a first electrode) Tx and outputs a mutual capacitance Cm) of the touch input. When the conductor approaches the mutual capacitance Cm, the quantity of charge of the mutual capacitance is reduced and the touch input can be sensed. For example, the first electrode Tx and the second electrode Rx may be disposed so as to cross each other on the base film BF.

During the touch sensor driving period T2, mutual capacitance sensors are driven by the sensor driving circuit 18 to move charges from the first electrode Tx to the second electrode Rx. At this time, the cathode electrode CAT is floated in response to the touch enable signal TEN. The charge transfer means that the touch driving signal applied to the first electrode Tx affects the potential of the second electrode Rx through the electrostatic capacitance.

The present invention can prevent the touch sensitivity from being lowered by the parasitic capacitance formed between the touch electrodes and the cathode electrode CAT by floating the cathode electrode CAT in the touch sensor driving period T2.

The present invention can minimize the loss of charges to be transferred from the first electrode Tx to the second electrode Rx into the cathode electrode CAT within the touch sensor driving period T2. Accordingly, it is possible to provide an organic light emitting diode display device having a touch sensor with improved mutual electrostatic capacitance (Cm) and improved touch sensitivity.

According to a preferred embodiment of the present invention, the floating cathode electrode CAT can function as a charge transfer layer of charge moving from the first electrode Tx to the second electrode Rx. In other words, when the distance between the cathode electrode CAT and the touch electrode Tx is smaller than the distance between the first electrode Tx and the second electrode Rx, the distance between the cathode electrode CAT and the touch electrode Tx, The cathode electrode CAT can function as a path for transferring charge from the first electrode Tx to the second electrode Rx in the case where Rx and Tx are positioned very close to each other. Therefore, by floating the cathode electrode CAT having a large area during the touch sensor driving period T2, the charge moving force of the charge moving from the first electrode Tx to the second electrode Rx can be improved . In addition, the cathode electrode CAT floated during the touch sensor driving period T2 functions as a barrier and can block noise from the display panel DIS.

8 to 10 are cross-sectional views illustrating examples of various laminated structures of the organic light emitting diode display device according to the present invention.

8, an organic light emitting diode display device according to an exemplary embodiment of the present invention includes a display panel DIS, a touch screen panel TSP1 disposed on a display panel DIS, and a touch screen panel TSP1. And a polarizing film (POL) disposed thereon.

The touch screen panel TSP1 includes the base film BF and the touch electrodes Tx and Rx provided on the bottom surface of the base film BF. The base film BF may be an encapsulating substrate (ECAP) provided to protect the elements of the display panel TSP from the external environment. That is, the elements constituting the touch sensor can be directly formed on the bottom surface of the sealing substrate (ECAP).

For example, the electrodes provided on the bottom surface of the sealing substrate (ECAP) include first electrodes (Tx) and second electrodes (Rx) intersecting with each other. At this time, any one of the first electrodes Tx and the second electrodes Rx is separated, and one of the separated electrodes is electrically connected through a bridge pattern. The first electrodes Tx and the second electrodes Rx are insulated from each other through an insulating film.

9, an OLED display according to another exemplary embodiment of the present invention includes a display panel DIS, a touch screen panel TSP2 disposed on the display panel DIS, and a touch screen panel TSP2. And a polarizing film (POL) disposed thereon.

The touch screen panel TSP2 includes the base film BF and the touch electrodes Tx and Rx provided on the upper surface of the base film BF. The base film BF may be an encapsulating substrate (ECAP) provided to protect elements of the display panel TSP2 from the external environment. That is, the elements constituting the touch sensor can be directly formed on the bottom surface of the sealing substrate (ECAP).

For example, the electrodes provided on the top surface of the sealing substrate (ECAP) include first electrodes (Tx) and second electrodes (Rx) which intersect each other. At this time, any one of the first electrodes Tx and the second electrodes Rx is separated, and one of the separated electrodes is electrically connected through a bridge pattern. The first electrodes Tx and the second electrodes Rx are insulated from each other through an insulating film.

10, an organic light emitting diode display device according to another embodiment of the present invention includes a display panel DIS, a polarizing film POL disposed on the display panel DIS, (TSP3). Between the polarizing film POL and the display panel DIS, an encapsulating substrate for protecting internal elements from the outside may be further provided.

For example, the touch screen panel TSP3 may include a first base film BF1 and a second base film BF2. The first electrodes Tx are arranged on the first base film BF1 and the second electrodes Rx are arranged on the second base film BF2. The first electrodes Tx and the second electrodes Rx may intersect with each other and are insulated from each other with the base film interposed therebetween.

The structure of the touch screen panel included in the organic light emitting diode display device according to the present invention is not limited to the above-described structure, and various types of touch screen panel structures may be included according to the designer's choice.

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. Therefore, the technical scope of the present invention should not be limited to the contents described in the detailed description of the specification, but should be defined by the claims.

DIS: Display panel TSP: Touch screen panel
TEN: Touch enable signal SW:
CAT: cathode electrode VSS: low potential voltage source
T1: display driving period T2: touch sensor driving period
Cm: mutual capacitance

Claims (11)

A display panel having a pixel array;
A touch screen panel having a touch sensor array;
A timing controller for time-dividing one frame into a touch sensor driving period for sensing a touch input and a display driving period for displaying an input image based on a touch enable signal;
A sensor driving circuit for driving the touch sensors of the touch sensor array during the touch sensor driving period;
A display driving circuit for driving the pixels of the display panel during the display driving period;
And a switching unit connecting a low potential voltage source to the common electrode of the pixels during the display driving period and interrupting a connection between the common electrode and the low potential voltage source of the pixels during the touch sensor driving period. The method according to claim 1,
And the common electrode of the pixels is a cathode electrode. The method according to claim 1,
The touch sensor includes:
An organic light emitting diode display device which is a mutual capacitance sensor. The method according to claim 1,
The touch screen panel includes:
A base film; And
And a plurality of touch electrodes provided on a bottom surface of the base film. The method according to claim 1,
The touch screen panel includes:
A base film; And
And the touch electrodes provided on the upper surface of the base film. 6. The method according to any one of claims 4 and 5,
Wherein the base film is an encapsulating substrate. The method according to claim 1,
And a polarizing film provided between the display panel and the touch screen panel. A method of driving an organic light emitting diode display device including a display panel having a pixel array and a touch screen panel in which touch sensors are arranged,
Generating a touch enable signal for defining one frame as a display driving period and a touch sensor driving period;
Connecting the common electrode of the pixel array to the low potential voltage source by turning on the switching unit according to the touch enable signal during the display driving period; And
And disconnecting the common electrode of the pixel array from the low potential voltage source by turning off the switching unit according to the touch enable signal during the touch sensor driving period. 9. The method of claim 8,
During the display driving period, the image data is written into the display panel through the display driving circuit,
And driving the touch sensors through a sensor driving circuit during the touch sensor driving period. A display panel having an organic light emitting diode; And
And a touch screen panel disposed on the display panel and having touch sensors,
The organic light emitting diode includes:
A first electrode;
An organic compound layer disposed on the first electrode; And
And a second electrode disposed on the organic compound layer,
Wherein the second electrode comprises:
Wherein the organic light emitting diode display is connected to the low potential voltage source through the switching unit, or is floating. 11. The method of claim 10,
The switching unit includes:
The second electrode is connected to the low potential voltage source during a display driving period for displaying an input image, and the cathode electrode is floated during a touch sensor driving period for sensing a touch input.

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