KR20170080967A - In-cell touch type organic light emitting display device and display driver - Google Patents

Abstract

The present invention provides a display device in which a plurality of pixels including an organic light emitting diode are disposed. In this display device, a plurality of sensing lines for receiving a characteristic sensing signal for each pixel are disposed, and a plurality of touch sensors including a TX electrode and an RX electrode which are connected to different sensing lines and are mutually coupled with each other in capacitance do. The display device includes a touch driving circuit for outputting a touch driving signal to a sensing line connected to the TX electrode in a touch driving period and receiving a reaction signal for a touch driving signal through a sensing line connected to the RX electrode.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an in-cell touch type organic light emitting display device and a display driver,

The present invention relates to an in-cell touch type organic light emitting display.

BACKGROUND ART Demands for a display device for displaying an image have been increasing in various forms as an information society has developed. Recently, a liquid crystal display device, a plasma display panel, an organic light emitting display device Organic Light Emitting Display Device) are being utilized.

The dual organic light emitting display uses an organic light emitting diode that emits light by itself, and thus has a high response speed, a high luminous efficiency, a high luminance and a wide viewing angle.

However, unlike other display devices, such organic light emitting display devices have a problem that it is difficult to form an in-cell type touch panel because electrodes used for light emission maintain a constant voltage in a display driving period.

Specifically, the liquid crystal display device displays the gray level by adjusting the transmittance of light emitted from the backlight unit. In this case, the display electrode and the common voltage electrode for controlling the transmittance may maintain a constant voltage difference with each other, Cell type touch panel because it is unnecessary to maintain the applied voltage.

On the other hand, since the organic light emitting display device displays the gray level by adjusting the driving voltage or the driving current supplied to the organic light emitting diode, the anode electrode and the cathode electrode used for light emission must be maintained at a specific voltage As a result, there has been a problem that such electrodes are difficult to be utilized as in-cell type touch electrodes.

In view of the foregoing, an object of the present invention is, in one aspect, to provide a technique for an in-cell touch type organic light emitting display.

In another aspect, an object of the present invention is to provide a technique for a display driver for driving an in-cell touch type organic light emitting display.

In another aspect, an object of the present invention is to provide a technique for detecting proximity or touch of an object to a panel using a sensing line for sensing characteristics of pixels disposed on the panel and a touch electrode built in the panel.

In another aspect, an object of the present invention is to provide a technique for driving an in-cell touch type organic light emitting display device in a mutual manner.

In order to achieve the above object, in one aspect, the present invention provides a display device in which a plurality of pixels including an organic light emitting diode are disposed. In this display device, a plurality of sensing lines for receiving a characteristic sensing signal for each pixel are disposed, and a plurality of touch sensors including a TX electrode and an RX electrode which are connected to different sensing lines and are mutually coupled with each other in capacitance do. The display device includes a touch driving circuit for outputting a touch driving signal to a sensing line connected to the TX electrode in a touch driving period and receiving a reaction signal for a touch driving signal through a sensing line connected to the RX electrode.

In another aspect, the present invention provides a display device in which a plurality of pixels including an organic light emitting diode are disposed. In this display device, a plurality of sensing lines for supplying a reference voltage to each pixel are arranged, and a plurality of touch sensors including a TX electrode and an RX electrode which are connected to different sensing lines and are mutually coupled with each other in capacitance are disposed. The display device includes a touch driving circuit for outputting a touch driving signal to a sensing line connected to the TX electrode in a touch driving period and receiving a reaction signal for a touch driving signal through a sensing line connected to the RX electrode.

In another aspect, the present invention provides a display driver connected to a plurality of data lines and a plurality of sensing lines arranged in a panel. The display driver includes a data driver for converting the image data into a data voltage and supplying the data voltage to the data line, and a characteristic sensing unit for sensing a characteristic value or a characteristic value variation of the pixel according to a characteristic sensing signal received from the sensing line in a display sensing interval. The display driver may further include a touch driver for outputting a touch driving signal to the first sensing lines of the plurality of sensing lines in the touch driving interval and receiving a response signal for the touch driving signal from the second sensing lines.

As described above, according to the present invention, an in-cell touch type organic light emitting display device can be realized. Further, according to the present invention, a display driver for driving the in-cell touch type organic light emitting display device can be implemented. According to the present invention, it is possible to detect proximity or touch of an object to a panel by using a sensing line for sensing the characteristics of pixels arranged on the panel and a touch electrode built in the panel. In addition, according to the present invention, an in-cell touch type organic light emitting display can be driven in a mutual manner.

1 is a schematic system configuration diagram of an OLED display 100 according to an embodiment.
Fig. 2 is a view showing the structure of each pixel and the touch sensor in Fig. 1. Fig.
3 is a view illustrating an operation period of the organic light emitting diode display according to an exemplary embodiment of the present invention.
Fig. 4 is a diagram showing switches connected to the sensing line and configurations connected to these switches. Fig.
5 is a diagram showing a switch connection relationship in a display sensing period.
6 is a diagram showing a switch connection relationship in a touch driving section.
7 is a view showing a touch sensor block including a touch sensor and a plurality of touch sensors.
FIG. 8 is a more detailed view of one touch sensor block in FIG.
9 shows M touch sensor blocks arranged in the sensing line direction.
10 is a flowchart of a method of driving the M touch sensor blocks in FIG.
11 is a diagram showing a connection relationship between TX electrodes of adjacent touch sensor blocks.
FIG. 12 is a view showing that TX electrodes located in K touch sensor blocks are connected to each other.
13 to 15 are views showing examples of shapes of the TX electrode and the RX electrode.
16 is a diagram showing that one sensing line is used as a TX sensing line and an RX sensing line.
17 is a view showing an example of a formation position of the touch electrode.

Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. It should be noted that, in adding reference numerals to the constituent elements of the drawings, the same constituent elements are denoted by the same reference symbols as possible even if they are shown in different drawings. In the following description of the embodiments of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

In describing the components of the invention, terms such as first, second, A, B, (a), (b), etc. may be used. These terms are intended to distinguish the constituent elements from other constituent elements, and the terms do not limit the nature, order or order of the constituent elements. When a component is described as being "connected", "coupled", or "connected" to another component, the component may be directly connected to or connected to the other component, It should be understood that an element may be "connected," "coupled," or "connected." In the same context, when an element is described as being formed on an "upper" or "lower" side of another element, the element may be formed either directly or indirectly through another element As will be understood by those skilled in the art.

1 is a schematic system configuration diagram of an OLED display 100 according to an embodiment.

1, an OLED display 100 may include a panel 110, a gate driver 120, a display driver 130, a timing controller 140, and the like.

A plurality of data lines DL, a plurality of gate lines GL and a plurality of sensing lines SL are disposed on the panel 110, and a plurality of pixels (SP: Sub Pixel) and a plurality of touch sensors Sensor) can be disposed.

The gate driver 120 may supply a scan signal of a turn-on voltage or a turn-off voltage to the gate line GL under the control of the timing controller 140. [

The display driver 130 includes a data driver 132 for supplying a data voltage to each pixel SP, a characteristic sensing unit 134 for sensing a characteristic value of each pixel SP, and a touch sensor TS, And a touch driver 134 for supplying the touch signal.

When the specific gate line GL is opened by the gate driver 120, the data driver 132 may convert the image data received from the timing controller 140 into an analog data voltage and supply the data voltage to the data line DL .

The characteristic sensing unit 134 may sense a characteristic value or a characteristic change amount for each pixel SP with a characteristic sensing signal received by the sensing line SL.

The touch driver 136 may supply a touch driving signal to the touch sensor TS and receive a response signal to the touch driving signal to sense proximity or touch of an external object to the panel 110. [

The timing controller 140 may supply various control signals to the gate driver 120, the data driver 132, the characteristic sensing unit 134, and the touch driver 136.

The timing controller 140 starts scanning according to the timing of each frame and switches the image data inputted from the outside according to the data signal format used in the data driver 132. [ The timing controller 140 outputs the converted image data to the data driver 132 and controls the data driving at a proper time according to the scan.

The gate driver 120, the data driver 132, the characteristic sensing unit 134, and the touch driver 136 may each include one or more integrated circuits. For example, the data driver 132 may include at least one source driver integrated circuit (SDIC).

Meanwhile, the data driver 132, the characteristic sensing unit 134, and the touch driver 136 may be implemented in one integrated circuit. For example, the display driver 130 including the data driver 132, the characteristic sensing unit 134, and the touch driver 134 may be implemented in the form of a touch display integrated circuit (TDDI) It is possible.

Meanwhile, a plurality of touch sensors (TS) are disposed on the panel 110, and a plurality of pixels (SP) can be positioned in one touch sensor area on a plane.

The touch sensor TS may be connected to the sensing line SL. The touch driver 136 may supply a touch driving signal to the touch sensor TS through the sensing line SL and a response signal to the touch driving signal through the sensing line SL.

Fig. 2 is a view showing the structure of each pixel and the touch sensor in Fig. 1. Fig.

2, the pixel SP includes an organic light emitting diode (OLED), a driving transistor (DRT) driving the organic light emitting diode OLED, a gate of the driving transistor DRT, A switching transistor SWT for transferring the data voltage to the second node N2 corresponding to the node and a storage capacitor Cstg for maintaining the data voltage for one frame time have.

The organic light emitting diode OLED may include a first electrode (e.g., an anode electrode or a cathode electrode), an organic layer, and a second electrode (e.g., a cathode electrode or an anode electrode).

The driving transistor DRT drives the organic light emitting diode OLED by supplying a driving current to the organic light emitting diode OLED.

The first node N1 of the driving transistor DRT may be electrically connected to the first electrode of the organic light emitting diode OLED and may be a source node or a drain node. The second node N2 of the driving transistor DRT may be electrically connected to a source node or a drain node of the switching transistor SWT and may be a gate node of the driving transistor DRT. The third node N3 of the driving transistor DRT may be electrically connected to a driving voltage line DVL for supplying a driving voltage EVDD and may be a drain node or a source node.

The driving transistor DRT and the switching transistor SWT may be either N-type or P-type as in the example of FIG.

The switching transistor SWT is electrically connected between the data line DL and the second node N2 of the driving transistor DRT and can be controlled by receiving the scan signal SCAN through the gate line to the gate node .

The switching transistor SWT may be turned on by the scan signal SCAN to transfer the data voltage Vdata supplied from the data line DL to the second node N2 of the driving transistor DRT.

The storage capacitor Cstg may be electrically connected between the first node N1 and the second node N2 of the driving transistor DRT.

The storage capacitor Cstg may be a parasitic capacitor (e.g., Cgs, Cgd) which is an internal capacitor existing between the first node N1 and the second node N2 of the driving transistor DRT And an external capacitor which is intentionally designed outside the driving transistor DRT.

In the case of the OLED display device 100, as the driving time of each pixel SP becomes longer, the degradation of the circuit elements such as the organic light emitting diode OLED and the driving transistor DRT may proceed have.

Accordingly, inherent characteristic values (e.g., threshold voltage, mobility, etc.) of the circuit elements such as the organic light emitting diode OLED and the driving transistor DRT can be changed. Such a change in the characteristic value of the circuit element may cause the luminance change of the corresponding pixel SP. In addition, the degree of change in the characteristic value between the circuit elements may be different depending on the degree of deterioration of each circuit element.

Here, the characteristic value of a circuit element (hereinafter also referred to as a " pixel characteristic value ") may include, for example, a threshold voltage and a mobility of the driving transistor DRT, And may include a threshold voltage.

The organic light emitting diode display 100 includes a sensing function for sensing a characteristic value or a characteristic variation amount of the pixel SP and a compensation function for compensating for the luminance variation between the pixel SP and the pixel SP using the sensing result .

The organic light emitting diode display 100 includes a compensation circuit including a pixel SP structure and a sensing and compensation structure so as to sense and compensate a characteristic value or a characteristic change amount of the pixel SP.

2, each of the pixels SP disposed in the panel 110 includes, for example, an organic light emitting diode (OLED), a driving transistor DRT, a switching transistor SWT, and a storage capacitor Cstg, And may further include a transistor (SENT: Sensing Transistor).

2, the sensing transistor SENT is electrically connected between a first node N1 of the driving transistor DRT and a sensing line SL that supplies a reference voltage Vref, And may be controlled by receiving a sensing signal SENSE, which is a kind of a scan signal.

The sensing transistor SENT is turned on by the sensing signal SENSE to apply the reference voltage Vref supplied through the sensing line SL to the first node N1 of the driving transistor DRT.

Also, the sensing transistor SENT may be utilized as one of the voltage sensing paths for the first node N1 of the driving transistor DRT.

In the organic light emitting diode display 100, the sensing line SL serves to transmit a reference voltage Vref for displaying an image during a display driving period, a reference voltage Vref for sensing a characteristic value of the pixel SP during a display sensing period, And serves to transmit the voltage Vref.

A plurality of touch sensors TS may be disposed on the panel 110 and a touch sensor TS may be connected to the sensing line SL. According to such connection, the sensing line SL serves to supply a touch driving signal to the touch sensor TS in a touch driving section and receive a reaction signal.

The sensing line SL may transmit a reference voltage Vref for driving the display, transmit a reference voltage Vref for sensing a characteristic value, and supply a touch driving signal according to the divided periods of time.

3 is a view illustrating an operation period of the organic light emitting diode display according to an exemplary embodiment of the present invention.

The operation period of the OLED display 100 may be divided into a display driving period Pd, a touch driving period Pts, and a display sensing period Pds_off and Pds_on.

The display driving period Pd is a period during which the data voltage is supplied to the driving transistor DRT of each pixel SP. In this display driving period Pd, the switching transistor SWT and the sensing transistor SENT are turned on according to the scan signal SCAN and the sensing signal SENSE, and the data voltage is supplied to the driving transistor DRT. In this interval, the reference voltage Vref for driving the display can be supplied to the sensing line SL.

The display sensing periods Pds_off and Pds_on may be divided into a display-off sensing period Pds_off and a display-on sensing period Pds_on.

The display off sensing period Pds_off is a display sensing period that is performed after a power-off signal is generated in response to a power-off request of the user. Since the display-off sensing period Pds_off is a period that is performed after power-off, the sensing period is relatively long. Accordingly, a characteristic value sensing operation requiring a relatively long time can be performed in the display-off sensing period Pds_off. For example, the threshold voltage of the driving transistor DRT or the organic light emitting diode OLED may be sensed in the display off sensing period Pds_off.

The display-on sensing period Pds_on is a sensing interval during which the screen display is recognized by the user before power-off. The display-on sensing period Pds_on may be advanced between the display driving period Pd and the touch driving period Pts. Since the display-on sensing period Pds_on is relatively short, a characteristic value capable of sensing in a short time can be sensed. For example, the mobility of the driving transistor DRT may be sensed in the display-on sensing period Pds_on.

In this display sensing period Pds_off and Pds_on, the sensing line SL transmits a reference voltage Vref for sensing the characteristic value to the pixel SP, and supplies a characteristic sensing signal corresponding to the characteristic value of each pixel SP to the characteristic sensing unit (134).

Here, the characteristic sensing signal may be, for example, the voltage of the node (the first node N1 in FIG. 2) where the driving transistor DRT and the organic light emitting diode OLED meet. The characteristic sensing unit 134 may measure the threshold voltage or the mobility of the driving transistor DRT using the voltage of the first node N1.

The touch driving section Pts is a section in which a touch driving signal is supplied to the touch sensor TS and a reaction signal for the touch driving signal is transmitted to the touch driving section 136. In this period, the sensing line SL transmits the touch driving signal and the reaction signal.

Meanwhile, the organic light emitting diode display 100 may be provided with a switch for changing the connection relation of the sensing lines SL in each section.

Fig. 4 is a diagram showing switches connected to the sensing line and configurations connected to these switches. Fig.

Referring to FIG. 4, the touch sensor TS may include a TX electrode TXE and an RX electrode RXE, and may be driven in a mutual manner.

The sensing line SL may be divided into a TX sensing line SLT for supplying a touch driving signal to the TX electrode TXE and an RX sensing line SLR for receiving a response signal.

The sensing line SL receives the characteristic sensing signal in the display sensing period Pds_off, Pds_on, and receives the response signal in the touch driving period Pts, as described with reference to FIG. Since the characteristic sensing signal is processed in the characteristic sensing unit 134 and the reaction signal can be processed in the touch driver 136, the sensing line SL may be connected to the characteristic sensing unit 134 according to the section, ).

A switch STM for changing the connection relationship of the sensing lines SL may be further disposed in the organic light emitting display 100. [

FIG. 5 is a diagram illustrating a switch connection relationship in a display sensing period, and FIG. 6 is a diagram illustrating a switch connection relationship in a touch driving interval.

Referring to FIG. 5, the switch STM connects the sensing line SL and the characteristic sensing unit 134 in the display sensing period. Accordingly, the characteristic sensing unit 134 can receive the characteristic sensing signal Sds from each pixel SP.

Referring to FIG. 6, the switch STM is connected to the touch driver 136 in the touch driving section. The touch driver 136 supplies the touch driving signal Stx to the TX electrode TXE through the TX sensing line SLT and the response signal Srx from the RX electrode RXE through the RX sensing line SLR, Can be received. 2, a sensing transistor SENT is positioned between a sensing node SL and a source node or a drain node of the driving transistor DRT. In this touch sensing period, the sensing transistor SENT is turned off, (SL) and the pixel (SP) can be separated.

Meanwhile, the TX electrode TXE and the RX electrode RXE may be arranged in units of a touch sensor block including a plurality of touch sensors TS.

FIG. 7 illustrates a touch sensor block including a touch sensor and a plurality of touch sensors, and FIG. 8 illustrates one touch sensor block in more detail in FIG.

7 and 8, a touch sensor block TSB is composed of N (N is a natural number) touch sensors TS_1, TS_2, ..., TS_N, and each touch sensor block TSB is provided with 1 TX electrodes TXE and N RX electrodes RXE_1, RXE2, ..., RXE_N can be located.

The TX electrode TXE may extend in the direction of the sensing line SL. The N RX electrodes RXE_1, RXE2, ..., RXE_N may be arranged in the sensing line SL direction facing the TX electrode TXE. According to this arrangement, one TX electrode TXE is disposed over the N touch sensors TS and the RX electrode RXE is disposed one by one to the respective touch sensors TS.

Each RX electrode RXE is capacitively coupled to the TX electrode TXE. Then, the touch driving signal Stx can be received through the capacitance.

Since the N RX electrodes RXE_1, RXE_2, ..., RXE_N are coupled to one TX electrode RXE, the touch drive signal Stx output to the TX electrode RXE is supplied to the N RX electrodes RXE_1 , RXE_2, ..., RXE_N).

A TX sensing line SLT may be connected to the TX electrode TXE and an RX sensing line SLR may be connected to the RX electrode RXE. The touch driver 136 may supply the touch driving signal Stx to the first sensing line SL1 and receive the response signal Srx through the RX sensing line SLR.

Each of the touch sensor blocks TSB includes one TX sensing line SLT connected to one TX electrode TXE and N RX sensing lines SLR_1, SLR_2, ..., SLR_N connected to N RX electrodes RXE_1, RXE_2, ..., RXE_N, respectively.

According to this connection, one touch driving signal Stx is supplied to the touch sensor block TSB and N reaction signals Srx1, Srx2, ... SrxN are supplied to the respective RX electrodes RXE_1, RXE2, ... , RXE_N). The touch driver 136 can confirm whether or not the object is touched with respect to each touch sensor TS in the touch sensor block TSB according to the N reaction signals Srx1, Srx2, ..., SrxN .

Meanwhile, M (M is a natural number) touch sensor blocks TSB may be disposed in the panel 110 in the longitudinal direction of the sensing line SL.

For the M touch sensor blocks TSB, the TX sensing line SLT is connected to only one TX electrode TXE located in one touch sensor block TSB, whereas the RX sensing line SLR is connected to the M And one RX electrode RXE for each of the touch sensor blocks TSB. The RX sensing electrodes SLR may be connected to a total of M RX electrodes RXE located in different touch sensor blocks TSB.

9 shows M touch sensor blocks arranged in the sensing line direction.

9, the first TX sensing line SLT_1 is connected to the TX electrode TXE of the first touch sensor block TSB_1 located on the first row, and the second TX sensing line SLT_2 is located on the second row And is connected to the TX electrode TXE of the second touch sensor block TSB_2. The MTX sensing line SLT_M is connected to the TX electrode TXE of the Mth touch sensor block TSB_M located on the Mth row.

The first RX sensing line SLR_1 is connected to the first RX electrode RXE_1 of the M touch sensor blocks TSB_1, TSB_2, ..., TSB_M located in M rows, and the first NRX sensing line SLR_N Are connected to the NRX electrode RXE_N of the M touch sensor blocks TSB_1, TSB_2, ..., TSB_M located in M rows, respectively.

Since the RX sensing electrode SLR is connected to the plurality of RX electrodes RXE, when the same touch driving signal Stx is transmitted to the RX electrode RXE connected to the same RX sensing line SLR, Can be difficult to distinguish.

Accordingly, the touch driver 136 can drive the M touch sensor blocks TSB in a time-division manner.

For example, the touch driver 136 supplies the touch driving signal Stx to the first touch sensor block TSB_1 located in the first row and then the N RX electrodes RXE from the reaction signal Srx. Next, the touch driver 136 supplies the touch driving signal Stx to the second touch sensor block TSB_2 located in the second row, and then supplies the N RX electrodes RXE The reaction signal Srx can be received. In this way, the touch driver 136 can sequentially supply the touch driving signals Stx to the M touch sensor blocks for each row at different times and receive the response signal Srx.

10 is a flowchart of a method of driving the M touch sensor blocks in FIG.

Referring to FIG. 10, the touch driver 136 firstly starts from the first row (S702), and supplies the touch driving signal Stx to the TX electrode TXE of K (K is a natural number) row (S704).

In order to sense the touch sensors TS of the K rows supplied with the touch drive signal Stx, the touch driver 136 receives the response signals R from the N RX sensing lines SLR located in the touch sensor block TSB region, (Srx) (S706).

When receiving the N reaction signals Srx for one row, the touch driver 136 changes the row (S708), and repeats the steps S704 and S706 for the corresponding row. This repetition is performed until the M-th row is reached (S710).

On the other hand, the TX electrode TXE is not connected to the TX electrode TXE located in the longitudinal direction of the sensing line SL. However, in the direction crossing the longitudinal direction of the sensing line SL, (TXE) may be connected to each other.

11 is a diagram showing a connection relationship between TX electrodes of adjacent touch sensor blocks.

Referring to FIG. 11, two touch sensor blocks TSB_A and TSB_B adjacent to each other in the direction crossing the longitudinal direction of the sensing line SL may constitute one touch sensor block pair (TSBP). The TX electrodes TXE of the two adjacent touch sensor blocks TSB_A and TSB_B may be connected to each other. In view of the touch sensor block pair (TSBP), two TX electrodes (TXE) located in the touch sensor block pair (TSBP) can be interconnected.

When the two TX electrodes TXE in the touch sensor block pair TSBP are connected to each other and the M touch sensor block pairs are arranged in the longitudinal direction of the sensing line SL, The M TX sensing lines SLT_1, SLT_2, ..., SLT_M are connected and 2N RX sensing lines SLR_1, ..., SLR_N, SLR_N + 1, SLR_2N connected to the RX electrodes are located have.

Meanwhile, the TX electrodes TXE located in three or more touch sensor blocks TSB may be connected to each other.

FIG. 12 is a view showing that TX electrodes located in K touch sensor blocks are connected to each other.

The TX electrodes TXE of the K touch sensor blocks TSB_A, TSB_B, ..., TSB_K arranged in the direction intersecting the TX sensing line SLT as shown in FIG. 12 can be interconnected.

In this connection, it is possible to drive all of the K touch sensor blocks TSB_A, TSB_B, ..., TSB_K through one TX sensing line SLT.

13 to 15 are views showing examples of shapes of the TX electrode and the RX electrode.

As shown in FIG. 13, the TX electrode TXE and the RX electrode RXE may be arranged in parallel to each other in the sensing line SL direction. At this time, two or more pixels may be disposed in a region where the TX electrode TXE is disposed and a region where the RX electrode RXE is disposed.

Alternatively, the TX electrode TXE and the RX electrode RXE may have the shape of a comb type as shown in FIG. In this shape, the length of the TX electrode (TXE) and the RX electrode (RXE) facing each other becomes long, so that the coupled capacitance (Cm) can be increased. On the other hand, the peripheral capacitance Cp formed between adjacent touch sensors can be relatively small. The coupling capacitance Cm is increased and the peripheral capacitance Cp is increased, the touch sensitivity is increased.

The TX electrode TXE and the RX electrode RXE may have a cross shape as shown in FIG. The long axes of the TX electrode TXE and the RX electrode RXE are formed in the direction crossing the sensing line SL and a plurality of TX electrodes TXE and RX electrodes RXE are formed in one touch sensor TS They can be arranged to cross each other. Since the length of the TX electrode TXE and the RX electrode RXE facing each other is long as in the case of the cross type shape combo type shape, the capacitance Cm to be coupled becomes large and the peripheral area The electrostatic capacitance Cp can be made relatively small.

Although the TX sensing line SLT and the RX sensing line SLR have been described above, one sensing line SL may be used as a TX sensing line SLT or an RX sensing line SLR.

16 is a diagram showing that one sensing line is used as a TX sensing line and an RX sensing line.

16, the touch driver 136 includes a TX circuit 1610 and an RX circuit 1620. Each of the sensing lines SL1 and SL2 is connected to the TX circuit 1610 and the RX circuit 1610 via a switch 1620, respectively.

The touch sensor TS includes a first touch sensor electrode TSE_1 and a second touch sensor electrode TSE_2. The TX circuit 1610 controls the first touch sensor electrode TSE_1 and the second touch sensor electrode TSE_2, 1 sensing line SL1. The RX circuit 1620 can receive the response signal from the second sensing line SL2 connected to the second touch sensor electrode TSE_2 through the control of the switch.

Conversely, the TX circuit 1610 supplies the touch driving signal to the second sensing line SL2 connected to the second touch sensor electrode TSE_2 through the control of the switch, and the RX circuit 1620 controls the switch And may receive the response signal from the first sensing line SL1 connected to the first touch sensor electrode TSE_1.

17 is a view showing an example of a formation position of the touch electrode.

Referring to FIG. 17, the touch sensor electrode TSE may be located on a different layer from the sensing transistor SENT and the sensing line SL. The touch sensor electrode TSE may be electrically connected to the sensing line SL located on another layer through the contact hole CNT. The touch sensor electrode TSE may be positioned between the substrate 1701 and the buffer layer 1703. [ At this time, the touch sensor electrode TSE may be formed as a transparent electrode.

A light shielding layer 1705 may be formed on the buffer layer 1703, and the touch sensor electrode TSE may be formed on the light shielding layer 1705. At this time, the light shielding layer 1705 may function as a touch sensor electrode TSE, in addition to blocking light directed toward the transistor.

The active layer 1709 is located on the buffer layer 1703 and the gate insulating film 1711 and the gate electrode 1713 can be sequentially positioned.

An interlayer insulating layer 1715 is disposed between the buffer layer 1703 and the sensing line SL and the contact hole CNT can connect the sensing line SL and the touch sensor electrode TSE across the interlayer insulating layer. Then, the sensing line SL can be protected by the passivation layer 1719.

The embodiment of the present invention has been described above. According to this embodiment, an in-cell touch type organic light emitting display can be realized. In addition, according to this embodiment, a display driver for driving an in-cell touch type organic light emitting display can be implemented, and a sensing line for sensing the characteristics of pixels arranged on the panel and a touch electrode It is possible to detect proximity or touch of an object to the panel. In addition, according to this embodiment, the in-cell touch type organic light emitting display can be driven in a mutual manner.

It is to be understood that the terms "comprises", "comprising", or "having" as used in the foregoing description mean that the constituent element can be implanted unless specifically stated to the contrary, But should be construed as further including other elements. All terms, including technical and scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs, unless otherwise defined. Commonly used terms, such as predefined terms, should be interpreted to be consistent with the contextual meanings of the related art, and are not to be construed as ideal or overly formal, unless expressly defined to the contrary.

The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

Claims (15)

A display device in which a plurality of pixels including an organic light emitting diode are arranged,
A plurality of sensing lines for receiving a characteristic sensing signal for the pixel;
A plurality of touch sensors including a TX electrode and an RX electrode connected to different sensing lines and mutually coupled with each other in a capacitance; And
A touch driving unit for outputting a touch driving signal to a sensing line connected to the TX electrode in a touch driving period and receiving a reaction signal for the touch driving signal through a sensing line connected to the RX electrode,
. The method according to claim 1,
Wherein one TX electrode and N RX electrodes are located in the touch sensor block, wherein the touch sensor block is composed of N (N is a natural number) touch sensors. 3. The method of claim 2,
M (M is a natural number) touch sensor blocks are arranged in the longitudinal direction of the sensing line,
The touch-
And outputs the touch driving signal to the M touch sensor blocks at different times. The method of claim 3,
And N sensing lines connected to one RX electrode for each of the M touch sensor blocks are disposed in the touch sensor block region. The method of claim 3,
Wherein a TX electrode of the touch sensor block is connected to a TX electrode of another touch sensor block disposed adjacent to the sensing line in a direction crossing the longitudinal direction of the sensing line. 3. The method of claim 2,
The two TX electrodes located in the pair of touch sensor blocks are electrically connected to each other with respect to a pair of touch sensor blocks composed of two touch sensor blocks arranged adjacent to each other in the direction crossing the longitudinal direction of the sensing line, . The method according to claim 6,
M (M is a natural number) pairs of touch sensor blocks are arranged in the longitudinal direction of the sensing line,
M sensing lines connected to the TX electrode and 2N sensing lines connected to the RX electrode are located in the touch sensor block pair region. The method according to claim 1,
A characteristic sensing unit connected to the sensing line in a display sensing period to receive the characteristic sensing signal; And
And a switch for connecting the sensing line to the characteristic sensing unit in the display sensing period and connecting the sensing line to the touch driving unit in the touch driving period. The method according to claim 1,
Wherein the TX electrode and the RX electrode are located on a different layer from the sensing line and are electrically connected to the sensing line through the contact hole. 10. The method of claim 9,
Wherein at least two pixels are located in a region where the TX electrode is arranged on a plane and a region where the RX electrode is arranged, and the TX electrode and the RX electrode have a comb type shape. The method according to claim 1,
In each pixel,
A driving transistor for driving the organic light emitting diode; a switching transistor for supplying a data voltage to a gate node of the driving transistor; and a gate electrode of the driving transistor, And a storage capacitor connected to the storage capacitor,
The characteristic-
Wherein a voltage or a current is formed at the source node or the drain node of the driving transistor. 12. The method of claim 11,
A sensing transistor is located between the source node or the drain node of the driving transistor and the sensing line,
And the sensing transistor is turned off in the touch driving period. A display device in which a plurality of pixels including an organic light emitting diode are arranged,
A plurality of sensing lines for supplying a reference voltage to the pixel;
A plurality of touch sensors including a TX electrode and an RX electrode connected to different sensing lines and mutually coupled with each other in a capacitance; And
A touch driving unit for outputting a touch driving signal to a sensing line connected to the TX electrode in a touch driving period and receiving a reaction signal for the touch driving signal through a sensing line connected to the RX electrode,
. 14. The method of claim 13,
In each pixel,
A driving transistor for driving the organic light emitting diode; a switching transistor for supplying a data voltage to a gate node of the driving transistor; and a gate electrode of the driving transistor, And a storage capacitor connected to the storage capacitor,
The reference voltage,
And supplying a reference voltage level for the data voltage to the source node or the drain node of the driving transistor. A display driver connected to a plurality of data lines and a plurality of sensing lines arranged on a panel,
A data driver converting the image data into a data voltage and supplying the data voltage to the data line;
A characteristic sensing unit sensing a characteristic value or a characteristic value change amount of a pixel according to a characteristic sensing signal received from the sensing line in a display sensing period; And
A touch driver for outputting a touch driving signal to the first sensing lines of the plurality of sensing lines in the touch driving section and receiving a reaction signal for the touch driving signal from the second sensing lines,
.

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