KR102366418B1 - Organic Light Emitting Diode Comprising Touch Screen Panel And Driving Method Of The Same - Google Patents

Abstract

The present invention can improve the touch sensitivity degradation problem by electrically blocking the cathode electrode and the low-potential voltage source during the driving period of the touch sensor. To this end, the organic light emitting diode display 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 time-divisions 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 the touch enable signal. The sensor driving circuit drives the mutual capacitive sensors during the touch sensor driving 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 electrodes of the pixels during the display driving period, and blocks the connection between the cathode electrodes of the pixels and the low-potential voltage source during the touch sensor driving period.

Description

Organic Light Emitting Diode Comprising Touch Screen Panel And Driving Method Of The Same

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

Recently, display devices such as a liquid crystal display, an electroluminescent display, and a plasma display panel have been attracting attention due to their fast response speed, low power consumption, and excellent color reproducibility. . Such display devices have been used in various electronic products such as TVs, computer monitors, notebook computers, mobile phones, display units of refrigerators, personal digital assistants, and automated teller machines. In general, such display devices configure an interface with a user by using various input devices such as a keyboard, a mouse, and a digitizer. However, using a separate input device, such as a keyboard and mouse, requires learning how to use it and causes inconvenience such as occupying space, making it difficult to improve the quality of the product. Accordingly, the demand for an input device that is convenient, simple, and capable of reducing malfunctions is increasing day by day. In response to such a request, a touch screen panel in which a user directly contacts a screen with a hand or a pen to input information has been proposed.

The touch screen panel is applied to various display devices because it is simple, has few malfunctions, allows input without using a separate input device, and the user can quickly and easily manipulate the contents displayed on the screen. is becoming

The touch screen panel is a resistive type that determines the touched position as a voltage gradient according to resistance in a state where a direct voltage is applied by forming a metal electrode on the upper or lower plate according to the method of sensing the touched part; A capacitive type that forms an equipotential in the conductive film and detects the touched part by detecting the position where the voltage change of the upper and lower plates according to the touch occurs. It can be distinguished as an electromagnetic induction type (Electro Magnetic type) for detecting a touched part.

The capacitive touch screen panel may be formed in an add-on type, an on-cell type, and an integrated type depending on the structure thereof. The top plate attachment type is a method in which the touch sensor is attached to the top plate of the display device after the display device and the touch sensor are separately manufactured. The integrated top plate 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 is a method in which a touch sensor is built into the display device to achieve thinness of the display device and increase durability.

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

An organic light emitting diode display according to the prior art includes a display panel including an organic light emitting diode, which is a self-luminous element, 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 a low potential voltage source (VSS) to receive a ground voltage, and an organic compound layer interposed between the anode electrode and the cathode electrode 5 do.

A touch screen panel for sensing a touch input or a gesture is disposed on the cathode electrode 5 . Touch sensors are arranged on the touch screen panel. Touch sensors are driven as mutual capacitive sensors. The mutual capacitance sensor includes a 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 a touch input based on the amount of charge change of the mutual capacitance sensed through the sensing electrode 4 . When the conductor approaches the mutual capacitance, the amount of charge in the mutual capacitance is reduced, so that a touch input can be sensed. The driving electrode 3 and the sensing electrode 4 are disposed to cross each other on the base film 1 .

In recent years, thanks to the development of technology, display devices are becoming 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 a built-in type. As such, when the sensors of the touch screen panel are located close to the cathode electrode 5, the following problems occur.

First, the parasitic capacitance increases due to the adjacent arrangement of the driving electrode 3 and the sensing electrode 4 and the cathode electrode 5 . In general, the sensitivity of touch sensing improves as the time constant becomes smaller, and the size of the time constant is proportional to the size of the parasitic capacitance and the size of the resistance value. There is this.

Second, referring to FIG. 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 and the sensing electrode 4 and the cathode electrode 5 are the cathode It is lost to the electrode (5). That is, when the charge moves from the driving electrode 3 to the sensing electrode 4, most of the charges flow out to the cathode electrode 5 connected to the low-potential voltage source Vss, and the amount of charge change before and after the touch cannot be properly sensed. .

In order to solve this problem, Korean Publication No. 10-2013-0009520 discloses a structure further including a conductive pattern layer between the touch screen panel and the cathode electrode. Referring to FIG. 3 , the conductive pattern layer is disposed between the touch electrodes 3 and 4 and the cathode electrode 5 to prevent electric charges from being lost to the cathode electrode 5 . Although charge loss can be prevented to some extent by providing the conductive pattern layer 7 , a significant portion of the moving charges is nevertheless lost to the cathode electrode 5 . In addition, a separate additional process is required to form the conductive pattern layer. The addition of the process may cause a problem of lowering the yield, and may increase the manufacturing cost and manufacturing time.

The present invention provides an organic light emitting diode display having improved touch sensitivity degradation by electrically blocking a common electrode and a low potential voltage source during a driving period of a touch sensor.

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

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

In a preferred embodiment of the present invention, by floating the cathode electrode during the driving period of the touch sensor, it is possible to prevent the touch sensitivity from being lowered by the parasitic capacitance formed between the touch electrodes and the cathode electrode.

According to a preferred embodiment of the present invention, it is possible to prevent the loss of electric charges to be transferred from the first electrode to the second electrode to the cathode electrode within the touch sensor driving period. Accordingly, the present invention can secure sufficient mutual capacitance, and can provide an organic light emitting diode display having a touch sensor with improved touch sensitivity.

According to a preferred embodiment of the present invention, the floating cathode electrode can function as a charge transfer layer for moving from the first electrode to the second electrode. That is, in a preferred embodiment of the present invention, by floating the cathode electrode having a large area during the driving period of the touch sensor, the charge transfer ability of the electric charge moving from the first electrode to the second electrode can be improved.

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

1 and 2 are cross-sectional views for explaining problems of an organic light emitting diode display including a touch screen panel according to the related art.
3 is a diagram schematically illustrating an organic light emitting diode display 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 capacitive 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 diagram schematically showing one pixel provided in the organic light emitting diode display according to the present invention.
7 is a cross-sectional view schematically illustrating an organic light emitting diode display according to a preferred embodiment of the present invention.
8 to 10 are cross-sectional views illustrating examples of various stacked structures of the organic light emitting diode display according to the present invention.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. Like reference numerals refer to substantially identical elements throughout. In the following description, if it is determined that a detailed description of a known technology or configuration related to the present invention may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

An organic light emitting diode display according to a preferred embodiment of the present invention will be described with reference to FIGS. 3 to 6 . 3 is a diagram schematically illustrating an organic light emitting diode display 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 capacitive 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 diagram schematically showing one pixel provided 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 a touch input 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 capacitance. Mutual capacitance may be formed between the intersecting electrodes.

The touch screen panel TSP implemented with the mutual capacitive sensor Cm, as shown in FIG. 4 , includes Tx electrode lines, Rx electrode lines intersecting Tx electrode lines, and intersections of Tx electrode lines and Rx electrode lines. It may include mutually capacitive sensors (Cm) formed for each. The Tx electrode lines are driving signal wires for supplying electric charges to the touch sensors by applying a touch screen panel driving signal to each of the mutual capacitance sensors Cm. The Rx electrode lines are sensor wires connected to the mutual capacitance sensors Cm to supply electric charges of the touch sensors to the sensor driving circuit 18 . In the mutual capacitance sensing method, a driving signal is applied to the Tx electrode through the Tx electrode line to supply electric charge to the mutual capacitance sensor (Cm), and the mutual capacitance sensor (Cm) is synchronized with the touch screen panel driving signal through the Rx electrode and the Rx electrode line. Cm), the touch input can be recognized by sensing the change in capacitance.

The sensor driving circuit 18 senses the amount of change in capacitance of the touch sensor before and after the touch, and determines whether a conductive material such as a finger is touched and its position.

The organic light emitting diode display device according to the present invention is time-division driven in 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 pixel. During the touch sensor driving period, the touch sensors are driven to sense a touch input.

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

The timing control signal generator 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 a 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 and the second level may be a high level, but vice versa.

The sensor driving circuit 18 is connected to a driving power unit (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 driving circuit 18 detects the amount of change in charge before and after the touch input from the touch sensor signal, compares the amount of change in the phone with a predetermined threshold, and determines the positions of the touch sensors having the amount of change in charge greater than or equal to the threshold as the touch input area. The sensor driving circuit 18 transmits touch data TDATA(XY) including touch input coordinate information to the external host system 19 by calculating coordinates for each touch input. The sensor driving circuit 18 includes an amplifier for amplifying the charge of the touch sensor, an integrator for accumulating the charge received from the touch sensor, an analog to digital converter (ADC) for converting the voltage of the integrator into digital data, and an arithmetic logic unit. . The operation logic unit compares the touch raw data output from the ADC with a threshold value, determines a touch input according to the comparison result, and executes a touch recognition algorithm that calculates coordinates.

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

Referring further to FIG. 6 , a plurality of data lines D and a plurality of gate lines G cross each other in the display panel DIS, and pixels are arranged in a matrix form at each intersection area. Each pixel includes an OLED, a driving thin film transistor (hereinafter referred to as TFT) that controls the amount of current flowing through the OLED (DT), a programming unit (SC) for setting the gate-source voltage of the driving TFT (DT), and a switching unit SW for connecting or blocking the common electrode of the pixels and the low potential voltage source VSS to each other.

The programming unit 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 to apply 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 adjust the amount of light emitted by the OLED. The amount of light emitted by the OLED is proportional to the amount of current supplied from the driving TFT (DT). These pixels are connected to the high-potential voltage source VDD and the low-potential voltage source VSS, and respectively receive high-potential power and low-potential power from a power generator (not shown). TFTs constituting the pixel may be implemented as p-type or n-type. In addition, the semiconductor layer of TFTs constituting the pixel may include amorphous silicon, polysilicon, or 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 voltage source VSS, and switches a current path between the low potential voltage source VSS and the common electrode according to 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 float the low potential voltage source VSS to the cathode electrode CAT. Floating means blocking a 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, so that the touch sensor driving period ( In T2), it is possible to prevent as much as possible the leakage of charges to be transferred from the first electrode Tx to the second electrode Rx to the cathode electrode CAT.

The display driving circuit includes the data driving circuit 12 , the gate driving circuit 14 , and the timing controller 16 to write the video data voltage of the input image to the pixels of the display panel DIS. The data driving circuit 12 converts 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 a gate pulse synchronized with the data voltage to the gate lines G1 to Gn to select pixels of the display panel DIS to which the data voltage is 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 . In response, the operation timings of the data driving circuit 12 and the gate driving circuit 14 are synchronized. The data timing control signal for controlling the data driving circuit 12 includes a source sampling clock (SSC), a source output enable signal (SOE), 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 (Gate Shift Clock), a gate output enable signal (Gate Output Enable, GOE), etc. 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) having a built-in scaler and converts digital video data RGB of an input image into a format suitable for display on the display panel DIS. The host system 19 transmits the timing signals Vsync, Hsync, DE, and MCLK together with the digital video data to the timing controller 16 . The host system 19 executes an application program associated with the touch position information XY input from the sensor driving circuit 18 .

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

An organic light emitting diode display according to a 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 devices are disposed. The substrate SUB may be formed of glass or a plastic material having flexible properties. For example, the substrate SUB is PI (polyimide), PET (polyethylene terephthalate), PEN (polyethylene naphthalate), PC (polycarbonate), PES (polyethersulfone), PAR (polyarylate), PSF (polysulfone), COC (ciclic- It may be formed of a material such as olefin copolymer). A pixel array including TFTs TAs and an OLED is formed on the substrate SUB.

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

The TFT (TA) includes at least one or more switching TFTs, 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 capable of driving an organic light emitting diode display, 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 is at least one selected from a hole injection layer (HIL), a hole transport layer (HTL), an electron transport layer (ETL), and an electron injection layer (EIL). may include more than one.

The cathode electrode CAT is connected to the input terminal of the low potential voltage source VSS through the switching unit SW. The switching unit SW connects the cathode electrode CAT and 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 to receive a ground voltage. The switching unit SW electrically cuts off 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 on the touch screen panel TSP. The sensors are driven as mutually capacitive sensors. The mutual capacitance sensor includes a mutual capacitance Cm formed between two electrodes Tx and Rx. The sensor driving circuit applies a driving signal (or stimulation signal) to any one of the two electrodes (hereinafter, the first electrode) (Tx), and the mutual capacitance ( Cm), the touch input is sensed. When the conductor approaches the mutual capacitance Cm, the amount of electric charge of the mutual capacitance is reduced, so that a touch input can be sensed. For example, the first electrode Tx and the second electrode Rx may be disposed to cross each other on the base film BF.

During the touch sensor driving period T2 , the mutual capacitive sensors are driven by the sensor driving circuit 18 to transfer electric charges from the first electrode Tx to the second electrode Rx. In this case, the cathode electrode CAT floats in response to the touch enable signal TEN. Charge transfer means that the touch driving signal applied to the first electrode Tx affects the potential of the second electrode Rx through capacitance.

In the present invention, by floating the cathode electrode CAT during the touch sensor driving period T2 , it is possible to prevent a decrease in touch sensitivity due to a parasitic capacitance formed between the touch electrodes and the cathode electrode CAT.

According to the present invention, it is possible to maximally prevent the loss of electric charges to be transferred from the first electrode Tx to the second electrode Rx to the cathode electrode CAT within the touch sensor driving period T2 . Accordingly, the present invention can ensure sufficient mutual capacitance (Cm), it is possible to provide an organic light emitting diode display having a touch sensor with improved touch sensitivity.

According to a preferred embodiment of the present invention, the floating cathode electrode CAT may function as a charge transfer layer for moving from the first electrode Tx to the second electrode Rx. In other words, as in the case where the distance between the cathode electrode (CAT) and the touch electrodes (Tx, Rx) is narrower than the distance between the first electrode (Tx) and the second electrode (Rx), the cathode electrode (CAT) and the touch electrode ( When Rx and Tx are located very adjacent to each other, the cathode electrode CAT may function as a movement path of charges moving from the first electrode Tx to the second electrode Rx. Accordingly, the present invention improves the charge transfer power of charges moving from the first electrode Tx to the second electrode Rx by floating the cathode electrode CAT having a large area during the touch sensor driving period T2. can do it Also, the floating cathode electrode CAT during the touch sensor driving period T2 functions as a barrier to block noise from the display panel DIS.

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

Referring to FIG. 8 , an organic light emitting diode display according to an embodiment of the present invention is provided on a display panel DIS, a touch screen panel TSP1 disposed on the display panel DIS, and a touch screen panel TSP1. and a disposed polarizing film (POL).

The touch screen panel TSP1 includes a base film BF and touch electrodes Tx and Rx provided on a lower surface of the base film BF. The base film BF may be an encapsulation substrate ECAP provided to protect elements of the display panel TSP from external environments. That is, elements constituting the touch sensor may be directly formed on the lower surface of the encapsulation substrate ECAP.

For example, the electrodes provided on the lower surface of the encapsulation substrate ECAP include first electrodes Tx and second electrodes Rx that cross each other. In this case, any one of the first electrodes Tx and the second electrodes Rx is separated, and any 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 layer.

Referring to FIG. 9 , an organic light emitting diode display according to another exemplary embodiment of the present invention is provided on a display panel DIS, a touch screen panel TSP2 disposed on the display panel DIS, and a touch screen panel TSP2. and a disposed polarizing film (POL).

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

For example, the electrodes provided on the upper surface of the encapsulation substrate ECAP include first electrodes Tx and second electrodes Rx that cross each other. In this case, any one of the first electrodes Tx and the second electrodes Rx is separated, and any 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 layer.

Referring to FIG. 10 , an organic light emitting diode display according to another exemplary embodiment of the present invention includes a display panel DIS, a polarizing film POL disposed on the display panel DIS, and a touch screen panel disposed on the polarizing film (TSP3). An encapsulation substrate for protecting an internal device from the outside may be further provided between the polarizing film POL and the display panel DIS.

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 disposed on the first base film BF1 , and the second electrodes Rx are disposed on the second base film BF2 . The first electrodes Tx and the second electrodes Rx may cross each other and are insulated from each other with a base film interposed therebetween.

The structure of the touch screen panel included in the organic light emitting diode display 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 a designer's selection.

Those skilled in the art through the above description will be able to make various changes and modifications without departing from the technical spirit of the present invention. Accordingly, 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: switching unit
CAT: cathode electrode VSS: low potential voltage source
T1: Display driving period T2: Touch sensor driving period
Cm: mutual capacitance

Claims (12)

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 the 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 pixels of the display panel during the display driving period;
a switching unit that connects a low potential voltage source to the common electrode of the pixels during the display driving period and cuts off the connection between the common electrode of the pixels and the low potential voltage source during the touch sensor driving period;
The touch sensors include a first electrode and a second electrode crossing each other,
The first electrode and the second electrode face the common electrode and are spaced apart from each other. The method of claim 1,
The common electrode of the pixels is a cathode electrode. The method of claim 1,
The touch sensor is
An organic light emitting diode display as a mutual capacitive sensor. The method of claim 1,
The touch screen panel,
base film; and
An organic light emitting diode display including touch electrodes provided on a lower surface of the base film. The method of claim 1,
The touch screen panel,
base film; and
An organic light emitting diode display including touch electrodes provided on an upper surface of the base film. 6. according to any one of claims 4 and 5,
The base film is an organic light emitting diode display as an encapsulation substrate. The method of claim 1,
The organic light emitting diode display device further comprising a polarizing film provided between the display panel and the touch screen panel. A method of driving an organic light emitting diode display including a display panel having a pixel array and a touch screen panel in which touch sensors are arranged, the method comprising:
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 a low potential voltage source by turning on a switching unit according to the touch enable signal during the display driving period; and
During the driving period of the touch sensor, turning off the switching unit according to the touch enable signal to cut off the connection between the common electrode of the pixel array and the low-potential voltage source,
The touch sensors include a first electrode and a second electrode crossing each other,
The first electrode and the second electrode face the common electrode and are spaced apart from each other. 9. The method of claim 8,
writing image data to the display panel through a display driving circuit during the display driving period;
During the driving period of the touch sensor, an organic light emitting diode display driving method for driving the touch sensors through a sensor driving circuit. a display panel including an organic light emitting diode; and
and a touch screen panel disposed on the display panel and provided with touch sensors,
The organic light emitting diode,
anode electrode;
an organic compound layer disposed on the anode electrode; and
a cathode electrode disposed on the organic compound layer;
The cathode electrode is
connected to a low potential voltage source through a switching unit, or floating,
The touch sensors include a first electrode and a second electrode crossing each other,
The first electrode and the second electrode face the cathode electrode and are spaced apart from each other. 11. The method of claim 10,
The switching unit,
An organic light emitting diode display device for connecting the cathode electrode to the low potential voltage source during a display driving period for displaying an input image, and floating the cathode electrode for a touch sensor driving period for sensing a touch input. The method of claim 1,
A distance between the common electrode and the first electrode and the second electrode is narrower than a distance between the first electrode and the second electrode.

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