KR102484503B1 - Organic Light Emitting Display Device and Driving Method of the Same - Google Patents

Abstract

The present invention relates to an organic light emitting display device and a driving method thereof. An organic light emitting display device according to an embodiment of the present invention includes a display panel having pixels including organic light emitting diodes and time-division driven so that at least a display driving period and a touch driving period are included in one frame; A data driver supplying data voltages to the data lines of the display panel, a gate driver supplying gate pulses synchronized with the data voltages to the gate lines of the display panel during the display driving period, and a touch driving signal during at least one touch driving period. The data driver senses a pixel current input through a sensing line that is connected to pixels and intersects with the gate lines, and controls the sensing line during at least one touch driving period. A touch signal input through the sensor may be sensed.

Description

Organic light emitting display device and driving method thereof {Organic Light Emitting Display Device and Driving Method of the Same}

The present invention relates to an organic light emitting display device implementing a touch sensor using a circuit for measuring and compensating for electrical characteristics of a driving TFT driving an organic light emitting pixel, and a method for driving the same.

A user interface (UI) enables communication between a person (user) and various electrical devices, electronic devices, etc., so that the user can easily control the device as desired. User interface technology continues to evolve in the direction of enhancing user sensibility and convenience of operation, evolving into touch UI, voice recognition UI, 3D UI, and the like.

Touch UI is essential for portable information devices such as smart phones, and is being applied to notebook computers, computer monitors, and home appliances. Recently, a technique of embedding touch sensors in a pixel array of a display panel (hereinafter referred to as an in-cell touch sensor) has been proposed.

In-cell touch sensor technology can install touch sensors on a display panel without increasing the thickness of the display panel. These touch sensors are coupled to the pixels through parasitic capacitance. In order to reduce mutual influence due to coupling between pixels and touch sensors, one frame period includes a period for driving pixels (hereinafter referred to as a display driving period) and a period for driving touch sensors (hereinafter referred to as a touch driving period). ) can be time-divided.

In-cell touch sensor technology uses electrodes connected to pixels of a display panel as electrodes of touch sensors. For example, in-cell touch sensor technology divides a common electrode for supplying a common voltage to pixels of a liquid crystal display device, There is a method of utilizing divided common electrode patterns as electrodes of touch sensors.

Such an in-cell touch sensor technology is difficult to apply to an organic light emitting display device including an organic light emitting diode (OLED) that emits light by itself. The reason is that the electrode patterning process for using internal electrodes as touch sensors is not easy in an organic light emitting display device, and the pixel structure of an organic light emitting display device is more complicated than that of a liquid crystal display device. The parasitic capacitance is relatively very large due to the coupling between them. When the parasitic capacitance increases, touch sensitivity and accuracy of touch recognition deteriorate.

Meanwhile, in order to apply the in-cell touch sensor technology to an organic light emitting display device, there is an attempt to pattern a cathode electrode and implement touch sensing in a self-capacitance type (Patent Application No. 10-2015-0108068). However, the technology disclosed in the patent is a top emission method applied to a small OLED display device, and it is difficult to pattern the cathode electrode in a large OLED panel that mainly uses the bottom emission method, and the anode There is a problem that touch sensing is difficult because the electrode serves as a shield.

In addition, since the technology is a self-capacitance type and applies a Tx signal (or stimulation signal) to the cathode electrode and then reads the change in capacitance value through the same electrode, the number of wires increases squarely as the size of the panel increases. there is

The present invention has been made in consideration of this situation, and an object of the present invention is to implement an in-cell touch technology in an organic light emitting display device.

Another object of the present invention is to implement an in-cell touch technology suitable for a large-size OLED panel of a back emission type.

Another object of the present invention is to implement a touch sensing technology in an OLED panel using existing electrodes without adding electrode wiring.

An organic light emitting display device according to an embodiment of the present invention includes a display panel having pixels including organic light emitting diodes and time-division driven so that at least a display driving period and a touch driving period are included in one frame; A data driver supplying data voltages to the data lines of the display panel, a gate driver supplying gate pulses synchronized with the data voltages to the gate lines of the display panel during the display driving period, and a touch driving signal during at least one touch driving period. The data driver senses a pixel current input through a sensing line that is connected to pixels and intersects with the gate lines, and controls the sensing line during at least one touch driving period. It is characterized in that sensing the touch signal input through the.

In one embodiment, the touch driving signal may include two or more pulses and may be generated with a voltage lower than a threshold voltage of a switch TFT included in pixels.

In one embodiment, the data driver includes an integrator for integrating the pixel current transmitted through the sensing line, a sample & hold unit for sampling, holding and storing the output of the integrator, and converting the value stored in the sample & hold unit into a digital value. It may be configured to include an analog-to-digital converter. In this case, the data driver may amplify the touch signal input through the sensing line using an integrator.

In an embodiment, the data driver may sense the pixel current during a vertical blank period, a power-on sequence period before display driving starts, or a power-off sequence period after display driving ends.

In one embodiment, the touch driver sequentially applies a touch driving signal in units of gate line groups including N gate lines (where N is a natural number equal to or greater than 2), and the data driver sequentially applies touch driving signals in units of sensing line groups in which two or more sensing lines are bundled. A touch signal can be sensed.

In an exemplary embodiment, the touch driver applies a touch driving signal to gate lines belonging to a plurality of gate line groups in each touch driving period, and sequentially applies the touch driving signal to the gate line groups belonging to the corresponding touch driving period. can do.

In one embodiment, one frame is time-divided into a data enable period and a vertical blank period, the data enable period is time-divided into a display drive period and a touch drive period, and during the touch drive period, the touch driver operates on a plurality of gate line groups. A touch driving signal is applied to gate lines belonging thereto, the data driver senses a touch signal input through a sensing line, and during a vertical blank period, the data driver supplies a sensing data voltage for sensing a pixel current to the data lines. The gate driver may supply a gate pulse synchronized with the sensing data voltage to a predetermined gate line, and the data driver may sense a pixel current input through the sensing line.

In one embodiment, the display driving period is a data enable period and the touch driving period is a vertical blank period, and during the first vertical blank period, the touch driver applies a touch driving signal to gate lines belonging to a plurality of gate line groups; , The data driver senses the touch signal input through the sensing line, and during the second vertical blank period following the first vertical blank period, the data driver supplies a sensing data voltage for sensing the pixel current to the data lines. , The gate driver may supply a gate pulse synchronized with the sensing data voltage to a predetermined gate line, and the data driver may sense a pixel current input through the sensing line.

In an exemplary embodiment, the touch driver may include a signal generator to generate touch driving signals and a shift register to sequentially supply touch driving signals to gate lines in units of gate line groups.

In an embodiment, the organic light emitting display device includes a plurality of first switches connected between output channels and gate lines of the gate driver and turned on during a data enable period, and output channels and gate lines of the touch driver. It may further include a plurality of second switches connected between the switches and turned on during the vertical blank period.

In one embodiment, the shift register includes a plurality of D flip-flops connected in cascade and a third switch connected to an output terminal of each of the flip-flops, and the third switches respond to the output signals of the flip-flops to N second switches. A touch driving signal may be simultaneously supplied to the switches.

A driving method of an organic light emitting display device according to another embodiment of the present invention includes an organic light emitting display panel including pixels including organic light emitting diodes and time-divisionally driven so that at least a display driving period and a touch driving period are included in one frame. Executed in the display device, supplying the data voltage of the input image to the data lines of the display panel and supplying gate pulses synchronized with the data voltage to the gate lines of the display panel during the display driving period, connecting to pixels supplying a touch driving signal to the gate lines and sensing the touch signal input through the sensing line during the step of sensing the pixel current input through the sensing line intersecting the gate lines and the at least one touch driving period. It is characterized by including steps.

Therefore, the in-cell touch technology can be applied to the OLED panel without separately patterning the cathode electrode of the OLED. In addition, it is possible to implement a touch sensing function without adding a separate Tx line and Rx line by using an existing gate line and a sensing line for external compensation of OLED. In addition, it is possible to simply change the driving signal applied to the gate line and process the touch sensing signal without adding a separate circuit by using an amplifier included in the external compensation circuit. In addition, by alternately driving external compensation and touch sensing during the vertical blank period, compensation of the driving TFT and touch sensing are possible in real time. In addition, by implementing the touch function in an in-cell method in an OLED display device, it is possible to reduce costs by not using a film for implementing a touch in an add-on method.

1 is a block diagram illustrating a driving circuit of an organic light emitting display device in which a touch sensor is integrated according to an embodiment of the present invention;
2 shows the configuration of a pixel array and a source driver IC for sensing current to measure the characteristics of a driving TFT driving an OLED;
3 shows a connection structure of a pixel and a sensing unit for implementing a current sensing method;
4 illustrates a configuration for applying a touch driving signal and sensing a touch signal by using the connection structure between the pixel and the sensing unit of FIG. 3 according to an embodiment of the present invention;
5 illustrates a configuration for applying a touch driving signal and sensing a touch signal by grouping a gate line and a sensing line, respectively, according to an embodiment of the present invention;
6 shows the timing of the touch driving signal of the present invention in the display timing of the VESA (Video Electronic Standards Association) standard,
7 illustrates a connection relationship between a gate line and a touch driver for applying a gate pulse and a touch driving signal to the gate line according to an embodiment of the present invention;
8 illustrates signals applied to gate lines and timing control signals of a gate driver and a touch driver according to an embodiment of the present invention;
9 illustrates an embodiment in which touch driving is alternately executed by a plurality of gate line groups in a vertical blank period and an embodiment in which external compensation driving and touch driving are alternately executed in each vertical blank period;
10 illustrates an embodiment in which a period excluding a vertical blank period in one frame is time-divided into a display driving period and a touch driving period.

Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the accompanying drawings. Like reference numbers throughout the specification indicate substantially the same elements. In the following description, if it is determined that a detailed description of a known function or configuration related to the present invention may unnecessarily obscure the subject matter of the present invention, the detailed description will be omitted.

An active matrix type organic light emitting display device includes an OLED that emits light by itself, and has great advantages such as fast response speed, luminous efficiency, luminance, and viewing angle.

An organic light emitting display device arranges pixels each including an OLED and a driving TFT (Thin Film Transistor) in a matrix form and adjusts the luminance of an image implemented in the pixels according to the gray level of video data. The driving TFT controls the driving current flowing through the OLED according to the voltage applied between its gate electrode and its source electrode. The amount of light emitted by the OLED is determined according to the drive current, and the luminance of the image is determined according to the amount of light emitted by the OLED.

When the driving TFT operates in the saturation region, the pixel current (Ip) flowing between the drain and source of the driving TFT changes depending on the electrical characteristics of the driving TFT, such as threshold voltage and electron mobility. As a result, the electrical characteristics of the driving TFT vary between pixels, and even if the same data voltage is applied to pixels with different electrical characteristics of the TFT, the luminance variation occurs for each pixel. If this characteristic variation is not compensated for, the desired quality image implementation is difficult.

An external compensation technique for compensating for electrical characteristic deviation of the driving TFT by sensing the electrical characteristics of the driving TFT and correcting digital data of an input image based on the sensing result is known. In this technology, a current sensing type sensing unit is mounted in a source driver IC (Integrated Circuit) to sense the electrical characteristics of the driving TFT, and the pixel current flowing through the driving TFT can be directly sensed through the current sensing type sensing unit. The current sensing type sensing unit accumulates the pixel current for a specific time through an integrator connected to a sensing line disposed perpendicular to the gate line (parallel to the data line) and changes the voltage into a voltage, and converts the voltage into an analog-to-digital converter (Analog - Obtain digital sensing values through a digital converter (hereinafter referred to as ADC).

On the other hand, the capacitive touch screen can be implemented with capacitance sensors, which can be divided into mutual capacitance type sensors and self capacitance type sensors. .

The mutual capacitance sensor includes mutual capacitance (CM) formed between the two electrodes (Tx and Rx), the Tx driving circuit applies the Tx signal (or stimulation signal) to the Tx line, and the touch sensing circuit applies the Rx signal. It receives the charge of mutual capacitance (CM) through the line and detects touch input based on the amount of change in charge before and after the touch. When the conductor approaches the mutual capacitance (CM), the mutual capacitance (CM) decreases, and the sensing circuit converts the charge change amount into digital data (hereinafter referred to as Touch Raw Data or TRD) through the ADC to print out

In the present invention, focusing on the fact that the gate line and the sensing line are orthogonal to the external compensation circuit and the ADC is included in the external compensation circuit in the OLED panel in which the external compensation function is implemented, the gate line for driving the OLED pixel and the sensing line provided for external compensation are provided. The touch signal is detected in a mutual capacitance method by using the Tx line and the Rx line for touch driving and sensing, respectively, but applying the touch driving signal to the gate line and sensing during a period excluding the display driving period for driving pixels in one frame period. A touch signal can be detected from the line.

In addition, in the present invention, a touch driving signal is applied to the gate line at a voltage lower than the operating range of the switch TFT for connecting the data line to the driving TFT, but in a negative direction (gate high voltage) from the common voltage (or gate low voltage). and the opposite direction), it is possible to increase the detection sensitivity of the touch signal by generating a touch driving signal that swings with a large amplitude.

In addition, in the present invention, a plurality of gate lines are bundled to apply a touch driving signal in a gate line group unit, and a plurality of sensing lines are bundled to sense a touch signal in a sensing line group unit to improve touch signal detection sensitivity. .

1 is a block diagram showing a driving circuit of an organic light emitting display device in which a touch sensor is integrated according to an embodiment of the present invention, and FIG. It shows the configuration of the pixel array and the source driver IC.

An organic light emitting diode display device according to an exemplary embodiment may include a display panel 10 , a timing controller 11 , a data driver 12 , a gate driver 13 , and a touch driver 16 .

In the display panel 10, a plurality of data lines, sensing lines 14A and 14B, and a plurality of gate lines 15 intersect, and pixels P for external compensation are arranged in a matrix form in each intersection area. to form a pixel array. The gate lines 15 may include a plurality of first gate lines 15A to which scan control signals are supplied and a plurality of second gate lines 15B to which sensing control signals are supplied. However, when the scan control signal and the sensing control signal have the same phase, the first and second gate lines 15A and 15B may be unified into one.

The pixel P may include an OLED, a driving TFT, a storage capacitor, a first switch TFT, and a second switch TFT. The TFTs constituting the pixel P may be implemented as a P type, an N type, or a hybrid type in which P and N types are mixed. Also, the semiconductor layer of the TFT may include amorphous silicon, polysilicon, or oxide.

Each pixel P has one of the data lines 14A, one of the sensing lines 14B, one of the first gate lines 15A, and one of the second gate lines 15B. can be connected to. A plurality of pixels P included in one pixel unit UPXL may share one sensing line 14B. The pixel unit UPXL may include four subpixels including a red subpixel, a green subpixel, a blue subpixel, and a white subpixel, but is not limited thereto. Also, although not shown, subpixels included in one pixel unit UPXL may be independently connected to a plurality of sensing lines without sharing one sensing line. Each of the pixels P is supplied with a high potential driving voltage and a low potential driving voltage from a power generator (not shown).

The organic light emitting display device of the present invention employs an external compensation technology, which senses the driving characteristics of pixels including the electrical characteristics of driving TFTs or changes in the characteristics, and digital data ( DATA) is corrected. Electrical characteristics of the driving TFT include the threshold voltage of the driving TFT and electron mobility of the driving TFT.

The timing controller 11 performs sensing driving (or external compensation driving) for sensing driving characteristics of pixels and updating a compensation value accordingly, and display driving for displaying an input image in which the compensation value is reflected, in a temporal manner according to a predetermined control sequence. can be separated By the control operation of the timing controller 11, external compensation driving is performed in the vertical blank period (or vertical blank time) during display driving, or in the power-on sequence period before display driving starts, or when display driving ends. It may be performed during a later power-off sequence period.

The vertical blank period is a period in which input image data DATA is not written, and is disposed between vertical active periods in which one frame of input image data DATA is written. The power-on sequence period refers to a transient period from when the driving power is turned on until an input image is displayed. The power-off sequence period means a transient period from when the display of the input image ends until the driving power is turned off.

External compensation driving for sensing and compensating driving TFT characteristics may be performed in a state in which only the screen of the display device is turned off while system power is being applied, such as a standby mode, sleep mode, or low power mode. The timing controller 11 may detect a standby mode, a sleep mode, a low power mode, etc. according to a predetermined detection process, and may control overall operations for external compensation driving.

The timing controller 11 temporally separates touch driving for applying a touch driving signal and sensing the touch signal and display driving, but may perform touch driving in a vertical blank period.

The pixel P may further include an internal compensation circuit. The internal compensation circuit includes one or more switch TFTs and one or more capacitors to initialize the gate of the driving TFT and then senses the threshold voltage and mobility of the driving TFT to compensate for the data voltage. Any known internal compensation circuit can be applied.

The timing controller 11 is a data driver (( 12) a data control signal DDC for controlling the operation timing of the gate driver 13, a gate control signal GDC for controlling the operation timing of the gate driver 13, and a touch control signal for controlling the operation timing of the touch driver 16 (TDC). The timing controller 11 temporally separates a period in which an image display is performed and a period in which an external compensation or touch sensing operation is performed, and controls signals (DDC, GDC, TDC) for image display, and control for external compensation. The signals DDC, GDC, and TDC and the control signals DDC, GDC, and TDC for touch sensing may be generated differently.

The gate control signal GDC includes a gate start pulse (GSP), a gate shift clock (GSC), a gate output enable signal (GOE), and the like. The gate start pulse GSP is applied to the gate stage generating the first scan signal and controls the gate stage to generate the first scan signal. The gate shift clock GSC is a clock signal commonly input to the gate stages and is a clock signal for shifting the gate start pulse GSP. The gate output enable signal GOE is a masking signal that controls the outputs of the gate stages.

The data control signal DDC includes a source start pulse (SSP), a source sampling clock (SSC), a source output enable signal (SOE), and the like. The source start pulse SSP controls data sampling start timing of the data driver 12 . The source sampling clock SSC is a clock signal that controls sampling timing of data in each of the source drive ICs based on a rising or falling edge. The source output enable signal SOE controls output timing of the data driver 12 . The data control signal DDC includes a reference voltage control signal RST and a sampling control signal SAM for controlling the operation of the sensing unit SU included in the data driver 12 . The reference voltage control signal RST controls timing for applying the reference voltage to the sensing line 14B. The sampling control signal SAM controls timing for sampling an analog sensing value according to an external compensation operation.

The touch control signal TDC may include a touch sync signal Tsync, a touch start pulse (TSP), a touch shift signal Tshift, a Tx pulse sync signal, and the like. The touch sync signal Tsync is a signal for synchronizing the display drivers 12 and 13 and the touch driver 16, and serves to time-divide one frame period into a display drive period and a touch drive period. The touch start pulse TSP is applied to the touch driver 16 to control the start timing of the touch drive so that the first touch drive signal is generated. The touch shift signal Tshift serves as a shift clock signal for shifting the gate line group to which the touch driving signal is applied when the touch driving signal is applied to each gate line group. The Tx pulse synchronization signal controls the timing of the pulse (Tx pulse) included in the touch driving signal and controls the sample & holding/converting timing of the touch sensing signal.

The timing controller 11 receives a digital sensing value SD according to an external compensation operation from the ADC of the data driver 12 . The timing controller 11 may compensate for the input digital video data RGB based on the digital sensing value SD to compensate for the deviation of electrical characteristics of the driving TFT between pixels or the deviation of deterioration of the OLED between pixels. . The timing controller 11 transmits compensated digital video data RGB to the data driver 12 during an operation period for image display.

In addition, the timing controller 11 may receive the digital touch raw data TRD according to the touch sensing operation from the ADC of the data driver 12 and generate coordinate information of the touch input using the digital touch raw data TRD.

The data driver 12 includes at least one source driver IC (Integrated Circuit) (SDIC). The source driver IC (SDIC) includes a plurality of digital-to-analog converters (hereinafter referred to as DACs) connected to data lines 14A, a plurality of sensing units (SU) connected to sensing lines 14B, and a plurality of ADCs. are included Each sensing unit SU is individually connected to each pixel P arranged on one pixel line (eg Li) through a sensing line 14B or one pixel line (eg Li) through a sensing line 14B. Li) may be commonly connected to a plurality of pixels (P) disposed on. Although one unit pixel UPXL composed of four pixels P is illustrated in FIG. 2 as sharing one sensing line 14B, the technical spirit of the present invention is not limited thereto. The technical spirit of the present invention may be applied to various modifications in which two or more pixels P are connected to one sensing unit SU through one sensing line 14B.

The DAC of the source driver IC converts the input image data DATA into display data voltages according to the data control signal DDC applied from the timing controller 11 when the display is driven, and supplies them to the data lines 14A. The data voltage for display is a voltage that varies according to the gray level of the input image.

The DAC of the source driver IC generates sensing data voltages according to the data control signal DDC applied from the timing controller 11 during sensing driving and supplies them to the data lines 14A. The data voltage for sensing is a voltage capable of turning on the driving TFT included in the pixel P during sensing driving. The data voltage for sensing may be generated with the same value for all pixels P. In addition, considering that pixel characteristics are different for each color, the data voltage for sensing may be generated with a different value for each color. For example, the data voltage for sensing is generated as a first value for first pixels P displaying a first color and as a second value for second pixels P displaying a second color. and may be generated as a third value for the third pixels P displaying the third color.

The sensing unit SU supplies the initialization voltage Vpre to the sensing line 14B based on the data control signal DDC or the analog sensing value input through the sensing line 14B (electrical voltage for OLED or driving TFT). characteristic value) can be sampled and held to be supplied to the ADC. The sensing unit SU may be implemented as a current sensing type.

In addition, the sensing unit (SU) samples the analog touch sensing value input through the sensing line (14B) based on the touch control signal (TDC) and supplies it to the ADC, and the ADC generates digital touch raw data (TRD). can

When the display is driven, the gate driver 13 generates a display gate pulse (or scan pulse) that is synchronized with the data voltage based on the gate control signal GDC to form the pixel lines Li, Li+1, and Li+2. , Li+3, ...) are sequentially supplied to the first gate lines 15A to select a pixel line on which data transfer is written. The pixel lines (Li, Li+1, Li+2, Li+3...) mean a set of horizontally adjacent pixels (P). The gate pulse swings between a gate high voltage (VGH) and a gate low voltage (VGL). The gate high voltage (VGH) is set to a voltage higher than the threshold voltage of the TFT to turn on the TFT, and the gate low voltage (VGL) is a voltage lower than the threshold voltage of the TFT.

The output terminals of the gate driver 13 are separated from the data lines 14A during the touch driving period and become a high impedance state, so that the gate driver 13 does not supply any voltage to the gate lines 15A during the touch driving period. don't

When sensing, the gate driver 13 generates a gate pulse for sensing based on the gate control signal GDC to apply to the pixel lines Li, Li+1, Li+2, Li+3, ... It is sequentially supplied to the connected first gate lines 15A. The gate pulse for sensing may have a wider on-pulse interval than the gate pulse for display. One or more ON pulse periods of the sensing gate pulse may be included within one line sensing ON time. Here, the 1-line sensing on-time means a scan time devoted to simultaneously sensing the pixels P of 1 pixel line (eg, Li).

When the touch is driven, the touch driver 16 generates the touch driving signal Tdrv based on the touch control signal TDC to form the pixel lines Li, Li+1, Li+2, Li+3, .. .) to the gate lines 15A or 15B, the touch driving signal Tdrv is supplied in units of groups of the plurality of gate lines 15A or 15B.

For example, the touch driver 16 groups the gate lines 15A in units of five, supplies the touch driving signal Tdrv to all gate lines belonging to the first group TX1 at the same time, and then second In a manner in which the touch driving signal Tdrv is simultaneously supplied to all gate lines belonging to the group TX2 , the touch driving signal Tdrv is sequentially supplied while shifting the gate line groups.

In addition, the touch driver 16 sequentially supplies the touch driving signal Tdrv from the first gate line group TX1 to the third gate line group TX3 in the first vertical blank period, for example, and The gate lines ( 15A) may be supplied with the touch driving signal Tdrv.

Since the touch driving signal Tdrv applied to the gate line 15A should not turn on the switch TFT, a voltage lower than the threshold voltage of the switch TFT must be applied and the touch signal can be detected with a larger amplitude. Two or more touch pulses (Tx pulses) may be generated in opposite directions to the gate high voltage (VGH). For example, when the gate pulse swings between a gate high voltage (VGH) of 28V and a gate low voltage (VGL) of -5V, the touch drive signal (Tdrv) will change from a gate low voltage (VGL) of -5V to -12V. You can swing between them.

3 shows a connection structure between a pixel and a sensing unit for realizing a current sensing method, and FIG. 4 shows a touch driving signal using the connection structure between a pixel and a sensing unit of FIG. 3 according to an embodiment of the present invention. It shows a configuration for applying and sensing a touch signal.

The pixel P may include an OLED, a driving TFT (DT), a storage capacitor (Cst), a first switch TFT (ST1) and a second switch TFT (ST2).

The OLED includes an anode electrode connected to the source node Ns, a cathode electrode connected to an input terminal of the low potential driving voltage EVSS, and an organic compound layer positioned between the anode electrode and the cathode electrode. The organic compound layer includes a hole injection layer (HIL), a hole transport layer (HTL), an emission layer (EML), an electron transport layer (ETL), and an electron injection layer, EIL) may be included.

The driving TFT (DT) controls the amount of current input to the OLED according to the gate-source voltage (Vgs). The driving TFT (DT) has a gate electrode connected to the gate node Ng, a drain electrode connected to the input terminal of the high potential driving voltage EVDD, and a source electrode connected to the source node Ns. The storage capacitor Cst is connected between the gate node Ng and the source node Ns. The first switch TFT ST1 applies the data voltage Vdata on the data line 14A to the gate node Ng in response to the scan control signal SCAN (or gate pulse). The first switch TFT (ST1) has a gate electrode connected to the gate line 15A, a drain electrode connected to the data line 14A, and a source electrode connected to the gate node Ng. The second switch TFT ST2 turns on/off the flow of current between the source node Ns and the sensing line 14B in response to the sensing control signal SEN. The second switch TFT (ST2) has a gate electrode connected to the second gate line 15B, a drain electrode connected to the sensing line 14B, and a source electrode connected to the source node Ns.

An external compensation technique for sensing and compensating for the characteristics of the driving TFT through the sensing unit SU will be briefly described.

The sensing unit SU directly senses the current Ip of the driving TFT transmitted through the sensing line 14B, and may include a current integrator CI and a sample & hold unit SH. The current integrator CI generates an analog sensing value Vsen by integrating current information introduced through the sensing line 14B. The current integrator (CI) has an inverting input terminal (-) that receives the current (Ip) of the driving TFT from the sensing line (14B), a non-inverting input terminal (+) that receives the reference voltage (Vpre) (or initialization voltage), and The amplifier (AMP) including the output terminal, the feedback capacitor (Cfb) connected between the inverting input terminal (-) and the output terminal of the amplifier (AMP), and the reset switch (RST) connected to both ends of the feedback capacitor (Cfb) include The current integrator (CI) is connected to the ADC through the sample & hold unit (SH). The sample & hold unit (SH) has a sampling switch (SAM) that samples the analog sensing value (Vsen) output from the amplifier (AMP) and stores it in the sampling capacitor (Cs), and the sensing value (Vsen) stored in the sampling capacitor (Cs). It may include a holding switch (HOLD) for delivering to the ADC.

The sensing drive for measuring the characteristics of the driving TFT (DT) includes an initialization period, a sensing period, and a sampling period.

During the initialization period, when the reset switch RST is turned on, the amplifier AMP operates as a unit gain buffer with a gain of 1. During the initialization period, input terminals (+, -) and output terminals of the amplifier AMP, the sensing line 14B, and the source node Ns are all initialized to the reference voltage Vpre.

During the initialization period, the data voltage for sensing is applied to the gate node Ng of the pixel P through the DAC of the source driver IC. Accordingly, a pixel current Ip corresponding to a potential difference (Vdata-Vpre) between the gate node Ng and the source node Ns flows through the driving TFT DT. During the initialization period, since the amplifier AMP continues to operate as a unit gain buffer, the output value Vsen of the current integrator CI maintains the reference voltage Vpre.

During the sensing period, when the reset switch RST is turned off, the amplifier AMP operates as a current integrator to integrate the pixel current Ip flowing through the driving TFT DT. At this time, the current integrator CI accumulates the pixel current Ip, and the potential difference between both ends of the feedback capacitor Cfb increases as the sensing time increases, that is, as the amount of accumulated current increases. However, due to the characteristics of the amplifier (AMP), the inverting input terminal (-) and the non-inverting input terminal (+) are shorted through a virtual ground and the potential difference between them is 0, so the inverting input terminal (-) during the sensing period The potential is maintained at the reference voltage Vpre regardless of the increase in the potential difference of the feedback capacitor Cfb. Instead, the potential of the output terminal of the amplifier AMP is lowered in response to the potential difference between both ends of the feedback capacitor Cfb. According to this principle, during the sensing period, the output value Vsen of the current integrator CI is changed into an integral value Vsen, which is a voltage value, through the feedback capacitor Cfb. As the current Ip flowing through the sensing line 14B increases, the falling slope of the output value Vsen of the current integrator CI increases, so the voltage difference between the reference voltage Vpre and the integral value Vsen also increases. do. During the sensing period, the integral value Vsen is stored in the holding capacitor Ch via the sampling switch SAM.

When the holding switch HOLD is turned on during the sampling period, the integral value Vsen stored in the holding capacitor Ch is input to the ADC via the holding switch HOLD. The integral value (Vsen) is converted into a digital sensing value (SD) by the ADC and then transmitted to the timing controller 11. The digital sensing value SD is used in the timing controller 11 to derive the threshold voltage deviation and mobility deviation of the driving TFT. The timing controller 11 stores the capacitance of the feedback capacitor Cfb, the reference voltage value Vpre, and the sensing time value in advance as digital codes, and from the digital sensing value SD, which is a digital code for the integral value Vsen, The source-drain current (Ip) flowing through the driving TFT (DT) can be calculated. The timing controller 11 derives deviation values and compensation data for deviation compensation by applying the digital sensing value SD to a compensation algorithm. The compensation algorithm may be implemented as a lookup table or calculation logic.

As described above, such external compensation driving may be performed during a vertical blank period during display driving, a power-on sequence period before display driving starts, or a power-off sequence period after display driving ends.

Since the external compensation operation is possible even when the scan control signal SCAN is used for the sensing control signal SEN in the circuit of FIG. 3 , the first and second gate lines 15A and 15B are used as gate lines hereinafter. and the first and second switch TFTs ST1 and ST2 are also controlled by the scan control signal SCAN.

The sensing unit (SU) for external compensation measures the current flowing through the driving TFT (DT) through the sensing line 14B, and the sensing line 14B is a first switch to apply a data voltage to the driving TFT (DT). Crosses the first gate line 15A for controlling the TFT ST1 or the second gate line 15B for controlling the second switch TFT ST2 for connecting the pixel circuit and the sensing unit SU, and senses Mutual capacitances CM1 and CM2 are formed between the line 14B and the first gate line 15A or the second gate line 15B to become a touch sensor.

Therefore, the sensing line 14B and the gate line 15 constitute a touch sensing circuit for sensing a touch, and the amplifier AMP of the sensing unit SU is input through the sensing line 14B, and the touch signal Rx is input. signal), it is possible to perform touch driving in the vertical blank period during display driving.

The circuit of FIG. 4 corresponds to a state in which the connection is disconnected by turning off the first and second switch TFTs (ST1 and ST2), the reset switch (RST) and the sampling switch (SAM) in the configuration of FIG. 3, and the gate line 15 and Since the sensing line 14B is connected to the mutual capacitance CM to correspond to the Tx line and the Rx line, and the amplifier AMP and the feedback capacitor Cfb serve as amplifiers, it can be used as a mutual capacitance type touch circuit.

When a touch driving signal (Vin) in the form of a plurality of pulses set to a voltage lower than the threshold voltage of the first and second switch TFTs (ST1 and ST2) is applied to the gate line 15 during the vertical blank period during display driving, the gate line (15) and the sensing line 14B are not connected to the driving circuit of the OLED, and an output voltage of Vout = (-C _M1 /C _fb ) x Vin + Vpre can be obtained at the output terminal of the amplifier (AMP). At this time, when a touch occurs, it is coupled to the gate line 15 and the magnitude of the output voltage detected by the sensing line 14B is changed so that the touch input can be sensed.

The sensing unit SU is provided from the timing controller 11 and is synchronized with the Tx pulse included in the touch driving signal, based on the control signal (Tx pulse synchronizing signal), the sampling switch SAM and the holding switch HOLD. ), it is possible to convert the output voltage of the amplifier (AMP) into digital touch raw data (TRD) in synchronization with the Tx pulse through the ADC and output it. In addition, in consideration of the case where a touch signal having a small change in amplitude is applied through the sensing line 14B, the output of the plurality of sensing lines 14B, that is, the output of the plurality of sensing units SU is grouped into one group. can be converted to digital through one ADC.

To detect the touch signal, a phase modulation circuit for rectifying the waveform and a low-frequency band filter for integrating the rectified AC waveform are added between the rear end of the amplifier (AMP) and the ADC, and switching for each touch driving operation and display driving operation. It can be.

The touch recognition algorithm may determine each touch raw data TRD to generate coordinate information XY of the touch input.

5 illustrates a configuration for applying a touch driving signal and sensing a touch signal by grouping a gate line and a sensing line, respectively, according to an embodiment of the present invention.

In the circuit of FIG. 4 , since the overlapping area of the gate line 15 and the sensing line 14B crossing each other is not large and the mutual capacitance is small, the change in output voltage caused by the touch, that is, the output from the amplifier (AMP) As a result, the change in the touch raw data (TRD) converted by the ADC becomes small, making it difficult to detect the touch signal properly.

In order to solve this problem, the plurality of gate lines 15 are grouped together to apply the same touch driving signal at the same time, but the touch driving signal is sequentially shifted in groups, and the plurality of sensing lines 14B are also grouped. A touch signal may be detected in a group unit.

In FIG. 5 , n gate lines 15A are grouped into l gate line groups TX1 to TX1, and sensing lines 14B are grouped into m sensing line groups RX1 to TXm.

When measuring pixel current for external compensation, each sensing line 14B is connected to a corresponding integrator (amplifier (AMP) in FIG. 3 or 4), but when touch driving is performed, a predetermined number of sensing lines 14B ) are bundled into one sensing line group, and the touch signal may be input to one amplifier (amplifier (AMP) in FIG. 4) and output as touch raw data (TRD) through an ADC.

6 illustrates the timing of the touch driving signal of the present invention in the display timing of the Video Electronic Standards Association (VESA) standard.

Referring to FIG. 6 , the data enable signal DE is synchronized with data of an input image. One pulse period of the data enable signal DE corresponds to one horizontal period, and a high logic period of the data enable signal DE indicates one-line data input timing. One horizontal period is a time (horizontal address time) required to write data to pixels of one line in the display panel 10 .

The data enable signal DE and the data of the input image are input during the vertical active time AT, and are not input during the vertical blank time VB. The vertical active time (AT) (also referred to as the data enable period) is the time required to display one frame of data on all pixels of the display area where the image is displayed on the display panel 10 (vertical address time). One frame period is a time required to display one frame of data on the display panel 10 and is the sum of one vertical active time (AT) and one vertical blank time (VB).

The vertical blank time (VB) includes a vertical sync time (VS), a vertical front porch (FP), and a vertical back porch (BP). The vertical sync time (VS) represents the start (or end) timing of one screen as the time from the falling edge of Vsync to the rising edge. The vertical blank time (VB) is approximately 475 μs or more at full high definition (FHD) resolution.

The Vertical Front Porch (FP) is the time from the falling edge of the last DE indicating the data timing of the last line of 1 frame data to the start of the Vertical Blank Time (VB). The vertical back porch (BP) is the time from the end of the vertical blank time (VB) to the rising edge of the first DE indicating the first line data timing of one frame data.

The display driving circuit including the data driver 12 and the gate driver 13 writes data of the input image to pixels during the vertical active time (AT), and the touch driver 16 writes data of the input image into the pixels during the vertical blank time (VB) (or During the vertical blank period) or during the vertical sync time VS, the touch driving signal Tdrv is applied to the gate line 15 of the display panel 10 and a touch input is sensed.

The timing controller 11 generates a touch synchronization signal Tsync as shown in FIG. 6 , and divides one frame into a display driving period Td corresponding to the vertical active time AT and a touch corresponding to the vertical blank time VB. It is time-divided by the driving period (Tt). The touch synchronization signal Tsync includes a first logic period defining a display driving period and a second logic period defining a touch driving period. In the example of FIG. 6 , the first logic period may be a low logic level period and the second logic period may be a high logic level period, but is not limited thereto.

The data driver 12 and the gate driver 13 write data of the input image to the pixels during the display driving period Td. The touch driver 16 supplies charge to the touch sensors through the gate line 15 during the touch drive period Tt and senses a touch input based on a change in charge before and after the touch.

In addition, the timing controller 11 generates a touch shift signal Tshift to sequentially apply the touch driving signal Tdrv in units of gate line groups. The touch shift signal Tshift is generated during the touch driving period Tt. It includes one or more high logic pulses and maintains a low logic during the display driving period Td. When a predetermined number of, for example, three gate line groups in FIG. 6 are sequentially driven during the touch driving period Tt, the touch shift signal Tshift includes three high logic pulses during the touch driving period Tt. do.

While the touch shift signal Tshift is at a first high logic level, the touch driving signal Tdrv is simultaneously applied to the gate lines 15 belonging to one gate line group, and the touch signal is sensed through the sensing unit SU. In the case of the second high logic, the touch driving signal Tdrv is simultaneously applied to the gate lines 15 belonging to the next gate line group and the touch signal is sensed, and the touch shift signal Tshift applies the touch driving signal. Shift the gate line group.

7 illustrates a connection relationship between a gate line and a touch driver for applying a gate pulse and a touch driving signal to the gate line according to an embodiment of the present invention, and FIG. 8 illustrates a connection relationship between a gate line according to an embodiment of the present invention. , and timing control signals of the gate driving unit and the touch driving unit are shown, and the display device of the present invention is time-divided into a display driving period Td and a touch driving period Tt.

The gate driver 13 includes a shift register and a level shifter. The shift register starts generating a gate pulse output in response to a gate start pulse (not shown) and shifts the output of the gate pulse according to the timing of a gate shift clock (not shown). The level shifter converts the output voltage level of the shift register into a voltage level that swings between a gate high voltage (VGH) and a gate low voltage (VGL).

The integrated circuit (IC) of the gate driver 13 may be mounted on a tape carrier package (TCP) and adhered to the substrate of the display panel 10 through a tape automated bonding (TAB) process. The gate driver 13 may be directly formed on the substrate of the display panel 10 through a gate in panel (GIP) process. The GIP circuit transfers the clock signal output from the level shifter to the shift register on the display panel 10, and the shift register shifts the clock signal from the level shifter and outputs it to the gate lines G1 to Gn.

The touch driver 16 may include a shift register 162 and a Tx signal generator 163 . The Tx signal generator 163 generates the touch driving signal Tdrv and supplies it to the shift register 162 . The touch driving signal Tdrv supplies charge to the mutual capacitance CM of the touch sensors, and may have various forms such as a square wave or a triangular wave.

The shift register 162 starts supplying the touch driving signal Tdrv to the gate lines G1 to Gn in a gate line group unit in response to the touch start pulse TSP and matches the timing of the touch shift signal Tshift. The touch driving signal Tdrv is shifted to the next gate line group. Since the shift register 162 shifts the output signal for each rising edge of the touch shift signal Tshift, it serves as a shift clock signal that controls the shift timing of the touch driver 16 . The IC of the touch driver 16 may be bonded to or directly formed on the substrate of the display panel 10 .

The shift register 162 includes a plurality of D flip-flops (FF) 161 cascaded and third switches SW3 connected to output terminals of each of the flip-flops 161 . The third switches SW3 are turned on in response to the output signal of the flip-flop 161, and N (N is a positive integer greater than or equal to 2 and is 5 in FIG. 7) second switches ( The touch driving signal Tdrv is simultaneously supplied to all gate lines belonging to one gate line group through SW2). Each of the third switches SW3 is connected to N gate lines belonging to one gate line group. The third switch SW3 is a TFT having an n-type Metal Oxide Semiconductor Field Effect Transistor (MOSFET) structure and may be formed on the substrate of the display panel 10 or the touch driver 16 . In the third switch SW3, the gate receives the output signal of the flip-flop 161, the drain is connected to the output channel of the TX signal generator 163, and the source of the N second switches SW2 Commonly connected to the drain.

A plurality of first switches SW1 and a plurality of second switches SW2 are connected to the gate lines G1 to Gn.

The first switch SW1 connects the output channel of the gate driver 13 to the gate lines during the display driving period Td in response to the low logic level of the touch synchronization signal Tsync inverted by the inverter INV. connect to 1 On the other hand, the first switch SW1 maintains an off state during the touch driving period Tt in response to the high logic level of the touch synchronization signal Tsync inverted by the inverter INV. Therefore, the output channel of the gate driver 13 is connected 1:1 to the gate lines G1 to Gn during the display driving period Td, and to the gate lines G1 to Gn during the touch driving period Tt. isolates and enters a high-impedance state.

The first switch SW1 is a TFT having an n-type MOSFET structure and may be formed on the substrate of the display panel 10 or on the gate driver 13 . In the first switch SW1, the gate is connected to the inverter INV to receive the inverted touch sync signal Tsync, the drain is connected to the output channel of the gate driver 13, and the source is connected to the gate lines G1 to G1. Gn) is connected.

The second switch SW2 connects the output channels of the touch driver 16 to the gate lines 1:1 during the touch driving period Tt in response to the high logic level of the touch synchronization signal Tsync. On the other hand, the second switch SW1 maintains an off state during the display driving period Td in response to the low level of the touch synchronization signal Tsync. Therefore, the output channel of the touch driver 16 is connected to the gate lines G1 to Gn during the touch driving period Tt, and is separated from the gate lines G1 to Gn during the display driving period Td to provide high impedance. become in a state

The second switch SW2 is a TFT having an n-type MOSFET structure and may be formed on the substrate of the display panel 10 or the touch driver 16 . In the second switch SW2, the gate receives the touch synchronization signal Tsync, the drain is connected to the output channel of the touch driver 16, and N connected to one gate line group (eg, FIG. 7 ). The source of the second switch (SW2) is connected to one third switch (SW3). Accordingly, the touch driving signal Tdrv output from one output channel of the touch driver 16 is simultaneously supplied to all gate lines belonging to one gate line group.

During each touch driving period Tt, a predetermined number of gate line groups may be selected and the touch driving signal Tdrv may be sequentially applied to the gate line groups during the corresponding period. In the example of FIG. 8 , in the touch driving period Tt Since the touch shift signal Tshift includes two pulses, the touch driving signal Tdrv is applied to two gate line groups during one touch driving period Tt. Also, in the example of FIG. 8, k gate lines form one gate line group.

During the display driving period Td of the first frame (Frame #1), the gate driver 13 sequentially supplies gate pulses to the gate lines G1 to Gn to sequentially write pixels one pixel line at a time. choose Next, the touch driver 16 applies the touch driving signal Tdrv to the gate lines G1 to Gk of the first gate line group TX1 during the touch driving period Tt of the first frame Frame #1. is supplied to simultaneously supply charges to all touch sensors connected to the first gate line group TX1, and then touch driving signal Tdrv to the gate lines G1+1 to G2k of the second gate line group TX2. ) to simultaneously supply charges to all touch sensors connected to the second gate line group TX2. Accordingly, the gate lines G1 to Gk of the first gate line group TX1 and the gate lines G1+1 to G2k of the second gate line group TX2 are respectively of the first frame Frame #1. During the touch driving period Tt, the first TX line and the second TX line operate.

The gate driver 13 sequentially supplies gate pulses to the gate lines G1 to Gn during the display driving period Td of the second frame Frame #2, and the touch driver 16 supplies gate pulses to the gate lines G1 to Gn in the second frame Frame #2. During the touch driving period Tt of #2), the touch driving signal Tdrv is sequentially applied to the gate lines of the third gate line group TX3 and the gate lines of the fourth gate line group TX4 in units of gate line groups. supply

Similarly, the gate driver 13 sequentially supplies gate pulses to the gate lines G1 to Gn during the display driving period Td of the (l/2)th frame Frame #(l/2), and touch During the touch driving period Tt of the (l/2)th frame Frame #(l/2), the driving unit 16 connects the gate lines of the (l−1)th gate line group TXl−1 and The touch driving signal Tdrv is sequentially supplied to the gate lines of the gate line group TX1 in units of gate line groups.

The touch driver 16 according to the embodiments of FIGS. 6 to 8 may be implemented in the gate driver 13 . In addition, the function of the touch driver 16 may be executed by the timing controller 11, that is, the touch driving signal Tdrv applied to the gate lines 15 during the touch driving period Tt in FIG. 8 is the timing controller ( 11) and may be applied to the gate lines 15 through the first switch SW1 during the touch driving period Tt. At this time, the first switch SW1 divides the display driving period Td and the touch driving period Tt according to the touch synchronization signal Tsync to selectively transmit the gate pulse and the touch driving signal Tdrv to the gate lines 15 It can be implemented in the form of a mux applied to . In addition, the timing controller 11 provides a control signal for selecting a gate line group to which the touch driving signal Tdrv is applied during the corresponding touch driving period Tt so that the gate line groups can be sequentially selected during the touch driving period Tt. can be created and provided.

9 illustrates an embodiment in which touch driving is alternately executed by a plurality of gate line groups in a vertical blank period and an embodiment in which external compensation driving and touch driving are alternately executed in each vertical blank period.

When the organic light emitting display panel 10 includes a circuit for external compensation, the external compensation operation may be performed during a vertical blank period, a power-on sequence period, or a power-off sequence period. In particular, when the external compensation operation is performed in the power-on sequence period or the power-off sequence period without performing the external compensation operation in the vertical blank period in real time, the vertical blank period may be entirely allocated to touch driving as shown in FIG. 9(a). can

In the embodiment of FIG. 9(a), the touch driving signal Tdrv is sequentially applied to a predetermined number (i in FIG. 9) of gate line groups during each touch driving period Tt (or vertical blank period). After the touch driving signal Tdrv is applied to a predetermined number of gate line groups during the touch driving period Tt, the touch driving signal Tdrv is applied to the next predetermined number of gate line groups during the next touch driving period Tt. In the application method, the sequential application of the touch driving signal Tdrv to all gate line groups is repeated.

In this way, by distributing and processing gate line groups for touch driving in a predetermined number of vertical blank periods, touch driving is possible in real time.

When the external compensation operation is performed in the vertical blank period in real time, the external compensation operation and the touch driving operation may alternately utilize the vertical blank period (or the touch driving period Tt). In the example of FIG. 9(b) , in the first touch driving period Tt, current sensing for an external compensation operation is performed, and in the next touch driving period Tt, the touch driving signal Tdrv is applied to a predetermined number of gate line groups. and a touch driving operation is performed.

An internal compensation operation may be performed during the display driving period Td in both the embodiments of FIG. 9(a) and FIG. 9(b).

As such, the external compensation circuit for compensating for the characteristics of the pixel including the OLED shown in FIGS. 3 and 4 is devoted to touch driving during at least one vertical blank period, enabling real-time touch driving, and also real-time As a result, external compensation and touch driving can be performed simultaneously.

10 illustrates an embodiment in which a period of one frame, excluding the vertical blank period, is time-divided into a display driving period and a touch driving period, and an external compensation operation may be performed in the vertical blank period. Since a touch driving operation and an external compensation operation are performed for each frame, touch driving is possible in real time even when applied to a large OLED display device.

Through the above description, those skilled in the art will know that various changes and modifications are possible without departing from the spirit of the present 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 determined by the claims.

10: display panel 11: timing controller
12: data driver 13: gate driver
14a: data line 14b: sensing line
15a/15b: first/second gate line 16: touch driver
161: D flip-flop 162: shift register
163: Tx signal generating unit SU: sensing unit

Claims (13)

a display panel including pixels including organic light emitting diodes and time-division driven so that at least a display driving period and a touch driving period are included in one frame;
a data driver supplying data voltages of an input image to data lines of the display panel during the display driving period;
a gate driver supplying gate pulses synchronized with the data voltage to gate lines of the display panel during the display driving period; and
a touch driver supplying a touch drive signal to the gate lines during at least one touch drive period;
The data driver senses a pixel current input through a sensing line connected to the pixels and crossing the gate lines, and senses a touch signal input through the sensing line during the at least one touch driving period; ,
The organic light emitting display device of claim 1 , wherein the sensing line and the gate line constitute a touch sensing circuit for sensing a touch during the touch driving period. According to claim 1,
The touch driving signal includes two or more pulses and is generated with a voltage lower than a threshold voltage of a switch TFT included in the pixels. According to claim 1,
The data driver includes an integrator for integrating the pixel current transmitted through the sensing line, a sample & hold unit for sampling, holding and storing the output of the integrator, and converting a value stored in the sample & hold unit into a digital value. An organic light emitting display device including an analog-to-digital converter. According to claim 3,
The data driver amplifies a touch signal input through the sensing line by using the integrator. According to claim 3,
wherein the data driver senses the pixel current during a vertical blank period, a power-on sequence period before display driving starts, or a power-off sequence period after display driving ends. According to claim 1,
The touch driver sequentially applies the touch driving signal in units of gate line groups including N gate lines (where N is a natural number equal to or greater than 2), and the data driver sequentially applies the touch driving signals in units of sensing line groups in which two or more sensing lines are bundled together. An organic light emitting display device that senses signals. According to claim 6,
The touch driver applies the touch driving signal to gate lines belonging to a plurality of gate line groups in each touch driving period, and sequentially applies the touch driving signal to gate line groups belonging to the corresponding touch driving period. light-emitting display device. According to claim 7,
The one frame is time-divided into a data enable period and a vertical blank period, and the data enable period is time-divided into the display driving period and the touch driving period;
During the touch driving period, the touch driver applies the touch driving signal to gate lines belonging to a plurality of gate line groups, and the data driver senses the touch signal input through the sensing line;
During the vertical blank period, the data driver supplies a sensing data voltage for sensing the pixel current to the data lines, and the gate driver supplies a gate pulse synchronized with the sensing data voltage to a predetermined gate line. and wherein the data driver senses a pixel current input through the sensing line. According to claim 6,
The display driving period is a data enable period and the touch driving period is a vertical blank period;
During a first vertical blank period, the touch driver applies the touch driving signal to gate lines belonging to a plurality of gate line groups, and the data driver senses the touch signal input through the sensing line;
During a second vertical blank period following the first vertical blank period, the data driver supplies a sensing data voltage for sensing the pixel current to the data lines, and the gate driver is synchronized with the sensing data voltage. The organic light emitting display device supplies a gate pulse to a predetermined gate line, and the data driver senses a pixel current input through the sensing line. According to claim 6,
wherein the touch driver includes a signal generator that generates the touch drive signal and a shift register that sequentially supplies the touch drive signal to the gate lines in units of the gate line group. According to claim 10,
a plurality of first switches connected between output channels of the gate driver and the gate lines and turned on during a data enable period; and
and a plurality of second switches connected between the output channels of the touch driver and the gate lines to be turned on during a vertical blank period. According to claim 11,
The shift register includes a plurality of D flip-flops connected in cascade and a third switch connected to an output terminal of each of the flip-flops,
wherein the third switches simultaneously supply the touch driving signal to the N second switches in response to the output signal of the flip-flop. A method of driving an organic light emitting display device including a display panel including pixels including organic light emitting diodes and time-division driven so that at least a display driving period and a touch driving period are included in one frame, the method comprising:
supplying a data voltage of an input image to data lines of the display panel and supplying gate pulses synchronized with the data voltage to gate lines of the display panel during the display driving period;
sensing a pixel current input through a sensing line connected to the pixels and intersecting the gate lines; and
supplying a touch driving signal to the gate lines and sensing a touch signal input through the sensing line during at least one touch driving period;
The method of claim 1 , wherein the sensing line and the gate line constitute a touch sensing circuit for sensing a touch during the touch driving period.

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