KR20220006781A - Touch display device and driving circuit - Google Patents

Abstract

Embodiments of the present invention relate to a touch display device and a driving circuit. The touch display device includes a common electrode necessary for a configuration of light emitting elements for self-light emission. The touch display device prevents generation of ripple noise in the common electrode of the light emitting elements through a polarity inversion driving method of a touch sensor or a panel structure change or eliminates or minimizes display driving influence caused by the generated ripple noise even though a voltage level of a touch driving signal for driving the touch sensor is changed when the touch sensor is embedded on the common electrode.

Description

Touch display device and driving circuit {TOUCH DISPLAY DEVICE AND DRIVING CIRCUIT}

Embodiments of the present disclosure relate to a touch display device and a driving circuit.

As the information society develops, various types of display devices for displaying images have been developed. Among such display devices, there is a self-luminous display in which light emitting elements emitting light by themselves are formed on the display panel without a backlight unit outside the display panel.

In the case of such a self-luminous display, each of a plurality of sub-pixels disposed on the display panel requires a light emitting device, several transistors for driving the light emitting device, and at least one capacitor.

Meanwhile, technology development for applying a touch-based input method that enables a user to easily and intuitively and conveniently input information or commands to a self-luminous display is in progress.

As such, in order to apply the touch-based input method to the self-luminous display, a touch panel including a touch sensor must be separately manufactured and combined with the display panel. This method has the disadvantages of increasing the size or thickness of the device and complicating the manufacturing process. Accordingly, a technology for embedding a touch sensor in a display panel without separately manufacturing a touch panel is being developed. When the touch sensor is embedded in the display panel, driving of the touch sensor may adversely affect display driving, which may cause a problem of degrading image display quality.

Embodiments of the present disclosure may provide a self-luminous display type touch display device having a built-in touch sensor capable of providing excellent image quality and precise touch sensitivity, and a driving circuit included therein.

Embodiments of the present disclosure may provide a self-luminous display type touch display device having a built-in touch sensor capable of eliminating or minimizing the influence of touch driving on display driving, and a driving circuit included therein.

Embodiments of the present disclosure include a common electrode necessary for the configuration of light emitting devices for self-luminescence, and when the touch sensor is built on the common electrode, even if the voltage level of the touch driving signal for driving the touch sensor is changed, the light emitting device It is possible to provide a touch display device and a driving circuit capable of preventing ripple noise from being generated in their common electrodes.

Embodiments of the present disclosure provide a touch display capable of eliminating or minimizing the influence of ripple noise on display driving even when ripple noise is generated in the common electrode of light emitting devices due to a voltage level change of a touch driving signal for driving a touch sensor. A device and a driving circuit may be provided.

Embodiments of the present disclosure include a plurality of data lines, a plurality of gate lines, and a plurality of subpixels, and include a plurality of light emitting devices corresponding to each of the plurality of subpixels, an encapsulation layer and an encapsulation layer disposed on the plurality of light emitting devices a display panel including a plurality of touch electrodes disposed on the layer; and when a first touch driving signal whose voltage level is changed is supplied to the first touch electrode among the plurality of touch electrodes, the voltage level is changed with the same frequency as the first touch driving signal, and the polarity is inverted compared to the first touch driving signal It is possible to provide a touch display device including a touch driving circuit for supplying a second touch driving signal with

The plurality of touch electrodes further include a third touch electrode adjacent to the first touch electrode in a column direction and a fourth touch electrode adjacent to the second touch electrode in a column direction, and the third touch electrode and the fourth touch electrode are disposed in a row direction. can be adjacent.

In the touch display device according to the embodiments of the present disclosure, the touch driving circuit supplies a first touch driving signal to a first touch electrode and a second touch electrode having a polarity inverted compared to that of the first touch driving signal as a second touch electrode. When the second touch driving signal is supplied, a third touch driving signal having the same frequency as the first touch driving signal and having the same polarity as the first touch driving signal is supplied to the third touch electrode and having the same frequency as the second touch driving signal and a fourth touch driving signal having the same polarity as the second touch driving signal may be supplied to the fourth touch electrode.

In the touch display device according to the embodiments of the present disclosure, the touch driving circuit supplies a first touch driving signal to a first touch electrode and a second touch electrode having a polarity inverted compared to that of the first touch driving signal as a second touch electrode. When supplying the second touch driving signal, a third touch driving signal having the same frequency as the second touch driving signal and having the same polarity as the second touch driving signal is supplied to the third touch electrode and having the same frequency as the first touch driving signal and a fourth touch driving signal having the same polarity as that of the first touch driving signal may be supplied to the fourth touch electrode.

The touch display device according to embodiments of the present disclosure may further include a data driving circuit driving a plurality of data lines and a gate driving circuit driving the plurality of gate lines.

The touch display device according to embodiments of the present disclosure may simultaneously perform display driving and touch driving. Accordingly, when the data driving circuit outputs data signals for image display to the plurality of data lines, the touch driving circuit may output the first touch driving signal and the second touch driving signal.

The touch display device according to the embodiments of the present disclosure may set the display driving area and the touch driving area to be spatially separated, and may simultaneously perform display driving and touch driving in each of the spatially separated display driving area and touch driving area. have.

Accordingly, when the touch driving circuit supplies the first touch driving signal and the second touch driving signal to the first and second touch electrodes, respectively, the touch driving circuit is configured to include the first touch electrode and the second touch electrode. A touch driving signal is not supplied to the touch electrodes included in the second touch electrode row spaced apart from the first touch electrode row in the column direction, and the gate driving circuit is turned on to one or more gate lines overlapping the second touch electrode row. A level gate signal can be output.

In the touch display device according to the embodiments of the present disclosure, each of the plurality of sub-pixels includes a light emitting device including a pixel electrode, a light emitting layer on the pixel electrode, and a common electrode on the light emitting layer, a driving transistor for driving the light emitting device, and a driving transistor and a switching transistor for switching whether to electrically connect the gate electrode and the data line, and a storage capacitor electrically connected between the gate electrode of the driving transistor and the source electrode or drain electrode of the driving transistor.

A pixel electrode is disposed in each of the plurality of subpixels and is electrically connected to a source electrode or a drain electrode of the driving transistor, the common electrode is disposed in common to the plurality of subpixels, and a base voltage having no voltage level change may be applied thereto.

Each of the plurality of touch electrodes may have a size corresponding to two or more sub-pixels.

In the touch display device according to the embodiments of the present disclosure, the display panel may further include a plurality of ground wires electrically connected to the common electrode. The plurality of ground wirings may be disposed to be spaced apart from the plurality of data lines.

At least one of the plurality of ground wirings may have a potential difference from an adjacent data line or a potential difference from an electrode connected to an adjacent data line among source and drain electrodes of the adjacent switching transistor.

The plurality of ground wires may be positioned below the common electrode, and the display panel may further include at least one insulating layer disposed on the plurality of ground wires. At least one insulating layer may have a plurality of contact holes, and the common electrode may be electrically connected to a portion of a plurality of ground wirings exposed through the plurality of contact holes.

Each of the plurality of ground wirings may be located on the same layer as at least one of a source electrode, a drain electrode, and a gate electrode of a switching transistor included in an adjacent subpixel.

In the touch display device according to the embodiments of the present disclosure, the display panel is positioned above the base line, positioned below the switching transistor or data line, overlaps at least a part of the base line, and at least a part of one electrode of the switching transistor Alternatively, it may further include a shield layer overlapping at least a portion of the data line electrically connected to one electrode of the switching transistor.

Here, the shield layer may be one of the first plate and the second plate constituting the storage capacitor.

In the touch display device according to the embodiments of the present disclosure, the frequencies of the first touch driving signal and the second touch driving signal may be integer multiples of the display frame frequency.

Embodiments of the present disclosure may include: a first touch driver supplying a first touch driving signal whose voltage level is changed to a first touch electrode among a plurality of touch electrodes; and when the first touch driving unit supplies the first touch driving signal to the first touch electrode, the second touch has the same frequency as the first touch driving signal, the voltage level is changed, and has an inverted polarity compared to the first touch driving signal. A driving circuit including a second touch driver supplying a driving signal to a second touch electrode adjacent to the first touch electrode in a row direction among the plurality of touch electrodes may be provided.

In the driving circuit according to the embodiments of the present disclosure, the first touch driving unit includes a preamplifier configured to receive the first touch driving signal and supply it to the first touch electrode, and detect the signal from the first touch electrode, and The touch driver may include a preamplifier configured to receive the second touch driving signal, supply it to the second touch electrode, and detect the signal from the second touch electrode.

Embodiments of the present disclosure include a plurality of data lines; A light emitting device including a pixel electrode, a light emitting layer and a common electrode, a driving transistor for driving the light emitting device, a switching transistor for controlling a connection between a gate electrode of the driving transistor and a data line, and a storage connected between the gate electrode and the pixel electrode of the driving transistor a plurality of subpixels including capacitors; an encapsulation layer disposed on the common electrode; a plurality of touch electrodes disposed on the encapsulation layer; a plurality of ground wires positioned below the common electrode and electrically connected to the common electrode; and at least a data line located above the plurality of ground lines, located below the switching transistor or data line, overlapping at least a portion of the ground line, and electrically connected to at least a portion of one electrode of the switching transistor or one electrode of the switching transistor. A touch display device including a plurality of shield layers partially overlapping may be provided.

The plurality of ground wirings may be disposed to be spaced apart from the plurality of data lines.

The touch display device according to embodiments of the present disclosure may further include a plurality of insulating layers disposed on a plurality of base wires and having a plurality of contact holes.

The common electrode may be in electrical contact with a portion of the plurality of ground wirings exposed through the plurality of contact holes.

Each of the plurality of shielding layers overlaps at least a portion of the base line to block one electrode of the switching transistor or a data line electrically connected to one electrode of the switching transistor from capacitively coupling with the base line, and It may overlap at least a portion of one electrode or at least a portion of a data line electrically connected to one electrode of the switching transistor.

Each of the plurality of shielding layers may be one of a first plate and a second plate constituting the storage capacitor.

In the touch display device according to the embodiments of the present disclosure, the plurality of touch electrodes include first and second touch electrodes adjacent to each other in a row direction, and a first touch driving signal in which a voltage level is changed at the first touch electrode When is applied, a second touch driving signal having the same frequency as the first touch driving signal, the voltage level being changed, and having a polarity inverted from that of the first touch driving signal may be applied to the second touch electrode.

Embodiments of the present disclosure include a plurality of data lines, a plurality of gate lines, and a plurality of subpixels, and include a plurality of light emitting devices corresponding to each of the plurality of subpixels, an encapsulation layer and an encapsulation layer disposed on the plurality of light emitting devices a display panel including a plurality of touch electrodes disposed on the layer; and a touch driving circuit that supplies a touch driving signal to at least one of the plurality of touch electrodes, but supplies a touch driving signal having a frequency corresponding to an integer multiple of a display frame frequency.

According to embodiments of the present disclosure, it is possible to provide a self-luminous display type touch display device having a built-in touch sensor capable of providing excellent image quality and precise touch sensitivity, and a driving circuit included therein.

According to embodiments of the present disclosure, it is possible to provide a self-luminous display type touch display device having a built-in touch sensor capable of eliminating or minimizing the influence of touch driving on driving a display, and a driving circuit included therein.

According to the embodiments of the present disclosure, even if the voltage level of the touch driving signal for driving the touch sensor is changed when the touch sensor is built on the common electrode and includes a common electrode necessary for the configuration of light emitting devices for self-luminescence, , it is possible to provide a touch display device and a driving circuit capable of preventing ripple noise from being generated in the common electrode of the light emitting devices.

According to the embodiments of the present disclosure, even if ripple noise is generated in the common electrode of the light emitting devices due to the voltage level change of the touch driving signal for driving the touch sensor, the influence of the ripple noise on driving the display can be eliminated or minimized. It is possible to provide a touch display device and a driving circuit.

1 is a system configuration diagram of a touch display device according to embodiments of the present disclosure.
2 is an exemplary diagram of a touch sensing system of a touch display device according to embodiments of the present disclosure.
3 is an equivalent circuit of a sub-pixel in a display panel of a touch display device according to embodiments of the present disclosure.
4 and 5 are diagrams illustrating a connection structure between a common electrode and a plurality of ground wires in a display panel of a touch display device according to embodiments of the present disclosure.
6 is a cross-sectional view of a display panel of a touch display device according to embodiments of the present disclosure.
7 and 8 are diagrams for explaining the effects of common electrode ripple noise and common electrode ripple noise induced in a common electrode by touch driving in a display panel of a touch display device according to embodiments of the present disclosure.
9 is a diagram illustrating touch driving in a non-inversion driving method of a touch display device according to embodiments of the present disclosure.
10 is a diagram illustrating a thermal inversion type touch driving for removing common electrode ripple noise in a touch display device according to embodiments of the present disclosure.
11 is a diagram illustrating touch driving in a dot inversion method for removing common electrode ripple noise in a touch display device according to embodiments of the present disclosure.
12 and 13 are diagrams for explaining a driving region division method for removing common electrode ripple noise in a touch display device according to embodiments of the present disclosure.
14 and 15 are diagrams for explaining a driving method for removing common electrode ripple noise in a touch display device according to embodiments of the present disclosure.
16 is a cross-sectional view of a display panel for reducing the effect of common electrode ripple noise on sub-pixels in a touch display device according to embodiments of the present disclosure;
17 is an equivalent circuit illustrating a phenomenon in which a common electrode ripple noise is prevented from being coupled to a data signal according to the cross-sectional view of FIG. 16 .
18 and 19 are examples of arrangement of base wires in a display panel of a touch display device according to embodiments of the present disclosure.

Hereinafter, some embodiments of the present disclosure will be described in detail with reference to exemplary drawings. In adding reference numerals to components of each drawing, the same components may have the same reference numerals as much as possible even though they are indicated in different drawings. In addition, in describing the present disclosure, if it is determined that a detailed description of a related known configuration or function may obscure the gist of the present disclosure, the detailed description may be omitted. When "includes", "having", "consisting of", etc. mentioned in this specification are used, other parts may be added unless "only" is used. When a component is expressed in the singular, it may include a case in which the plural is included unless otherwise explicitly stated.

In addition, in describing the components of the present disclosure, terms such as first, second, A, B, (a), (b), etc. may be used. These terms are only for distinguishing the elements from other elements, and the essence, order, order, or number of the elements are not limited by the terms.

In the description of the positional relationship of the components, when it is described that two or more components are "connected", "coupled" or "connected", two or more components are directly "connected", "coupled" or "connected" ", but it will be understood that two or more components and other components may be further "interposed" and "connected," "coupled," or "connected." Here, other components may be included in one or more of two or more components that are “connected”, “coupled” or “connected” to each other.

In the description of the temporal flow relationship related to the components, the operation method or the production method, for example, the temporal precedence relationship such as "after", "after", "after", "before", etc. Alternatively, when a flow precedence relationship is described, it may include a case where it is not continuous unless "immediately" or "directly" is used.

On the other hand, when numerical values or corresponding information (eg, level, etc.) for a component are mentioned, even if there is no separate explicit description, the numerical value or the corresponding information is based on various factors (eg, process factors, internal or external shock, Noise, etc.) may be interpreted as including an error range that may occur.

1 is a system configuration diagram of a touch display device 100 according to embodiments of the present disclosure.

Referring to FIG. 1 , the touch display device 100 includes a display panel 110 , a data driving circuit 120 , a gate driving circuit 130 , and a display controller 140 as components for displaying an image. may include

The display panel 110 may include a display area DA in which an image is displayed and a non-display area NDA in which an image is not displayed. The non-display area NDA may be an area outside the display area DA, and may also be referred to as a bezel area. The non-display area NDA may be an area visible from the front side of the touch display device 100 or an area that is bent and not visible from the front side of the touch display device 100 .

The display panel 110 may include a plurality of sub-pixels SP. For example, the touch display device 100 may be various types of display devices including a liquid crystal display device, an organic light emitting diode display device, a micro light emitting diode (micro LED) display device, a quantum dot display device, and the like. The structure of each of the plurality of sub-pixels SP may vary according to the type of the touch display device 100 . For example, when the touch display device 100 is a self-luminous display device in which the sub-pixels SP emit light by themselves, each sub-pixel SP includes a light-emitting device that emits light, one or more transistors, and one or more capacitors. may include

In addition, the display panel 110 may further include various types of signal wires to drive the plurality of sub-pixels SP. For example, various types of signal wirings include a plurality of data lines DL transmitting data signals (also referred to as data voltages or image signals) and a plurality of data lines transmitting gate signals (also referred to as scan signals). may include a gate line GL of

The plurality of data lines DL and the plurality of gate lines GL may cross each other. Each of the plurality of data lines DL may be disposed while extending in a column direction. Each of the plurality of gate lines GL may be disposed while extending in a row direction.

Here, in this specification, the column direction and the row direction are relative. For example, the column direction may be a vertical direction and the row direction may be a horizontal direction. As another example, the column direction may be a horizontal direction and the row direction may be a vertical direction.

The data driving circuit 120 is a circuit for driving the plurality of data lines DL, and may output data signals to the plurality of data lines DL. The gate driving circuit 130 is a circuit for driving the plurality of gate lines GL, and may output gate signals to the plurality of gate lines GL. The display controller 140 is a device for controlling the data driving circuit 120 and the gate driving circuit 130 , and controls driving timings for the plurality of data lines DL and driving timings for the plurality of gate lines GL. can be controlled

The display controller 140 supplies various types of data driving control signals DCS to the data driving circuit 120 to control the data driving circuit 120 , and provides various types of data driving control signals to control the gate driving circuit 130 . Different types of gate driving control signals GCS may be supplied to the gate driving circuit 130 .

The data driving circuit 120 may supply data signals to the plurality of data lines DL according to the driving timing control of the display controller 140 . The data driving circuit 120 receives digital image data DATA from the display controller 140 and converts the received image data DATA into analog data signals to form a plurality of data lines DL ) can be printed.

The gate driving circuit 130 may supply gate signals to the plurality of gate lines GL according to the timing control of the display controller 140 . The gate driving circuit 130 receives a first gate voltage corresponding to a turn-on level voltage and a second gate voltage corresponding to a turn-off level voltage along with various gate driving control signals GCS to generate gate signals. and the generated gate signals may be supplied to the plurality of gate lines GL. Here, the turn-on level voltage may be a high level voltage, and the turn-off level voltage may be a low level voltage. Conversely, the turn-on level voltage may be a low level voltage, and the turn-off level voltage may be a high level voltage.

In order to provide a touch sensing function as well as an image display function, the touch display device 100 senses a touch panel and the touch panel to detect whether a touch has occurred by a touch object such as a finger or a pen or detect a touch position. It may include a touch sensing circuit 150 that

The touch sensing circuit 150 includes a touch driving circuit 160 that generates and outputs touch sensing data by driving and sensing the touch panel, and a touch controller capable of detecting a touch occurrence or a touch position using the touch sensing data. (170) and the like.

The touch panel may include a plurality of touch electrodes TE as sensors. The touch panel may further include a plurality of touch routing wires TRW for electrically connecting the plurality of touch electrodes TE and the touch driving circuit 160 . The touch panel or the touch electrode TE is also referred to as a touch sensor.

The touch panel may exist outside the display panel 110 or may exist inside the display panel 110 . When the touch panel is external to the display panel 110 , the touch panel is referred to as an external type. When the touch panel is of an external type, the touch panel and the display panel 110 may be separately manufactured and combined. The external touch panel may include a substrate and a plurality of touch electrodes TE on the substrate.

When the touch panel is present inside the display panel 110 , the touch panel is referred to as a built-in type. When the touch panel is a built-in type, the touch panel may be formed in the display panel 110 during the manufacturing process of the display panel 110 .

The touch driving circuit 160 may supply a touch driving signal to at least one of the plurality of touch electrodes TE and sense at least one of the plurality of touch electrodes TE to generate touch sensing data.

The touch sensing circuit 150 may perform touch sensing using a self-capacitance sensing method or a mutual-capacitance sensing method.

When the touch sensing circuit 150 performs touch sensing in a self-capacitance sensing method, the touch sensing circuit 150 performs a touch based on capacitance between each touch electrode TE and a touch object (eg, finger, pen, etc.) sensing can be performed.

When the touch sensing circuit 150 performs touch sensing using a mutual-capacitance sensing method, the touch sensing circuit 150 may perform touch sensing based on capacitance between the touch electrodes TE.

According to the mutual-capacitance sensing method, the plurality of touch electrodes TE are divided into driving touch electrodes and sensing touch electrodes. The touch driving circuit 160 may drive the driving touch electrodes and sense the sensing touch electrodes.

According to the self-capacitance sensing method, each of the plurality of touch electrodes TE may serve as both a driving touch electrode and a sensing touch electrode. The touch driving circuit 160 may drive all or part of the plurality of touch electrodes TE and sense all or part of the plurality of touch electrodes TE.

For example, the touch driving circuit 160 and the touch controller 170 may be implemented as separate devices or as one device.

For example, the touch driving circuit 160 and the data driving circuit 120 may be implemented as separate integrated circuits. Alternatively, all or part of the touch driving circuit 160 and all or part of the data driving circuit 120 may be integrated with each other to be implemented as a single integrated circuit.

For example, the touch display device 100 according to embodiments of the present disclosure includes a display panel such as an organic light emitting diode (OLED) display, a quantum dot display, and a micro light emitting diode (LED) display. 110 may be a self-luminous display including a light-emitting element capable of self-emitting.

2 is an exemplary diagram of a touch sensing system of the touch display device 100 according to embodiments of the present disclosure.

As described above, the touch sensing system of the touch display device 100 according to embodiments of the present disclosure includes a plurality of touch electrodes TE, a plurality of touch routing wires TRW, and a touch driving circuit 160, a touch It may include a controller 170 and the like.

Referring to FIG. 2 , in the touch display device 100 according to embodiments of the present disclosure, the data driving circuit 120 may include a plurality of data driving units DDRV, and the touch driving circuit 160 may include a plurality of data driving units DDRV. It may include a touch driver TDRV.

Each of the plurality of data drivers DDRV may be implemented as a separate integrated circuit. Each of the plurality of touch drivers TDRV may be implemented as a separate integrated circuit.

Alternatively, at least one data driver DDRV and at least one touch driver TDRV may be integrated to be implemented as one integrated integrated circuit 200 .

Accordingly, the touch display device 100 according to embodiments of the present disclosure includes one or more integrated integrated circuits 200 , and each integrated integrated circuit 200 includes at least one data driver DDRV and at least one It may include a touch driver TDRV.

For example, in the touch display device 100 according to embodiments of the present disclosure, each of the plurality of integrated integrated circuits 200 may be mounted on the circuit film 210 . One side of the plurality of circuit films 210 on which the plurality of integrated integrated circuits 200 are mounted may be electrically connected to the display panel 110 . The other side of the plurality of circuit films 210 on which the plurality of integrated integrated circuits 200 are mounted may be electrically connected to the printed circuit board 220 .

Referring to FIG. 2 , in the touch display device 100 according to embodiments of the present disclosure, each of the plurality of touch electrodes TE is electrically connected to the touch driver TDRV through at least one touch routing wire TRW. can be connected

The plurality of touch electrodes TE may be located on the same layer, and the plurality of touch routing wires TRW may be located on a different layer from the plurality of touch electrodes TE.

The plurality of touch electrodes TE include a first touch electrode TE1 , a second touch electrode TE2 adjacent to the first touch electrode TE1 in a row direction, and a third touch electrode TE1 adjacent to the first touch electrode TE1 in a column direction. The touch electrode TE3 may include a fourth touch electrode TE4 adjacent to the third touch electrode TE3 in a row direction.

The first touch electrode TE1 is electrically connected to the first touch routing wire TRW1, the second touch electrode TE2 is electrically connected to the second touch routing wire TRW2, and the third touch electrode TE3 ) may be electrically connected to the third touch routing wire (TRW3), and the fourth touch electrode (TE4) may be electrically connected to the fourth touch routing wire (TRW4).

The first touch routing wire TRW1 overlaps the third touch electrode TE3 but is not electrically connected to the third touch electrode TE3 . The second touch routing wire TRW2 overlaps the fourth touch electrode TE4 but is not electrically connected to the fourth touch electrode TE4.

Each of the plurality of touch electrodes TE may overlap one or more subpixels SP.

For example, one touch electrode TE may overlap two or more subpixels SP. That is, the area size of one touch electrode TE may correspond to the area size of two or more sub-pixels SP. In this case, each of the plurality of touch electrodes TE may overlap two or more data lines DL and may overlap two or more gate lines GL.

Since the first touch electrode TE1 and the second touch electrode TE2 are disposed in the same row of the touch electrodes, they may overlap the same two or more gate lines GL. Since the third touch electrode TE3 and the fourth touch electrode TE4 are disposed in the same row of the touch electrodes, they may overlap the same two or more gate lines GL.

Since the first touch electrode TE1 and the third touch electrode TE3 are disposed in the same touch electrode column, they may overlap the same two or more data lines DL. Since the second touch electrode TE2 and the fourth touch electrode TE4 are disposed in the same touch electrode column, they may overlap the same two or more data lines DL.

Each of the plurality of touch electrodes TE may be a mesh-type electrode in which a plurality of openings are formed. At least one of the plurality of openings in each touch electrode TE may correspond to a light emitting area of the subpixel SP or may correspond to a transmissive area (or a transparent area).

3 is an equivalent circuit of a sub-pixel SP in the display panel 110 of the touch display device 100 according to embodiments of the present disclosure.

Referring to FIG. 3 , each of the plurality of subpixels SP includes a light emitting device ED, a driving transistor DT for driving the light emitting device ED, a gate electrode of the driving transistor DT, and a data line DL. ) includes a switching transistor (SWT) that switches whether or not electrical connection between can do.

The gate electrode of the driving transistor DT corresponds to the first node n1 . A source electrode or a drain electrode of the driving transistor DT corresponds to the second node n2 . A drain electrode or a source electrode of the driving transistor DT corresponds to the third node n3 .

The light emitting device ED may include a pixel electrode PE, an emission layer EL, and a common electrode CE. The emission layer EL may be located on the pixel electrode PE, and the common electrode CE may be located on the emission layer EL. For example, the light emitting device (ED) is a device for a self-luminous display, and is an organic light emitting diode (OLED), a light emitting device made of quantum dots, or a micro light emitting diode (micro LED). and the like.

A drain electrode or a source electrode of the switching transistor SWT may be electrically connected to the data line DL. A source electrode or a drain electrode of the switching transistor SWT may be electrically connected to a gate electrode of the driving transistor DT at the first node n1 . The gate electrode of the switching transistor SWT may be electrically connected to the scan signal line SCL, which is one type of the gate line GL. On/off of the switching transistor SWT may be controlled by the scan signal SCAN supplied from the scan signal line SCL.

The storage capacitor Cst may be electrically connected between the first node n1 and the second node n2 . The storage capacitor Cst may serve to maintain a voltage difference between the first node n1 and the second node n2 for a predetermined time (eg, one frame time). The storage capacitor Cst is not an internal capacitor (parasitic capacitor) of the driving transistor DT, but an external capacitor designed to drive the subpixel SP.

In the above, it has been described that each subpixel SP includes two transistors DT and SWT and two capacitors Cst together with the light emitting element ED. However, each subpixel SP includes one or more It may further include a transistor, and in some cases may further include one or more capacitors.

For example, as shown in FIG. 3 , each subpixel SP may further include a sensing transistor SENT that controls whether or not the second node n2 is connected to the reference voltage line RVL. .

A drain electrode or a source electrode of the sensing transistor SENT may be electrically connected to the reference voltage line RVL. The source electrode or the drain electrode of the sensing transistor SENT may be electrically connected to the source electrode or the drain electrode of the driving transistor DT at the second node n2 , and may also be electrically connected to the pixel electrode PE. The gate electrode of the sensing transistor SENT may be electrically connected to the sense signal line SENL, which is one type of the gate line GL. On/off of the sensing transistor SENT may be controlled by the sense signal SENSE supplied from the sense signal line SENL.

Referring to FIG. 3 , the pixel electrode PE is disposed in each of the plurality of subpixels SP and may be electrically connected to a source electrode or a drain electrode of the driving transistor DT. That is, at the second node n2 , the pixel electrode PE may be electrically connected to a source electrode or a drain electrode of the driving transistor DT.

The common electrode CE may be disposed in common to the plurality of subpixels SP. A ground voltage EVSS in the form of a DC voltage having no voltage level change may be applied to the common electrode CE. Here, the base voltage EVSS may correspond to a common voltage commonly applied to the light emitting devices ED of all subpixels SP.

Referring to FIG. 3 , the display panel 110 of the touch display device 100 according to embodiments of the present disclosure may further include a plurality of ground lines EVSL electrically connected to the common electrode CE.

When the plurality of ground lines EVSL are used, the ground voltage EVSS may be uniformly applied to the entire region of the common electrode CE. The supply method of the ground voltage EVSS using a plurality of ground wires EVSL provides an effective supply of the ground voltage EVSS when the common electrode CE having a large area is provided due to the large area display panel 110 . can do.

4 and 5 are diagrams illustrating a connection structure between a common electrode CE and a plurality of base lines EVSL in the display panel 110 of the touch display device 100 according to embodiments of the present disclosure.

4 and 5 , the plurality of base lines EVSL are disposed to be spaced apart from the plurality of data lines DL and parallel to the plurality of data lines DL so as not to cross the plurality of data lines DL. can be arranged.

For example, each of the plurality of base interconnections EVSL may be disposed in one subpixel column. Alternatively, each of the plurality of ground lines EVSL may be disposed in each of two or more subpixel columns. Alternatively, each of the plurality of ground lines EVSL may be disposed in one pixel column or in each of two or more sub-pixel columns. Here, one pixel column may include two subpixel columns, three subpixel columns, or four subpixel columns.

4 and 5 , each of the plurality of ground lines EVSL may be electrically connected to the common electrode CE through one or more contact holes CNT. Accordingly, the ground voltage EVSS may be applied to the plurality of ground lines EVSL and the common electrode CE together.

For example, as shown in FIG. 4 , one base line EVSL may be electrically connected to the common electrode CE through two contact holes CNT. Two contact holes CNT to which one base line EVSL and the common electrode CE are electrically connected may be located at an upper end point and a lower end point.

Accordingly, since the ground voltage EVSS is applied to both the upper end point and the lower end point of the common electrode CE, the base voltage EVSS may be uniformly applied to the common electrode CE.

For another example, as shown in FIG. 5 , one base line EVSL may be electrically connected to the common electrode CE through three or more contact holes CNT. The three or more contact holes CNT to which one ground line EVSL and the common electrode CE are electrically connected may be located at an upper end point, a lower end point, and one or more intermediate points.

Accordingly, since the ground voltage EVSS is applied to the upper end point, the lower end point, and one or more intermediate points of the common electrode CE, the base voltage EVSS may be more uniformly applied to the common electrode CE.

6 is a cross-sectional view of the display panel 110 of the touch display device 100 according to embodiments of the present disclosure.

Referring to FIG. 6 , the display panel 110 of the touch display device 100 includes a substrate SUB. A plurality of sub-pixels SP are formed on the substrate SUB. Each of the plurality of subpixels SP includes a light emitting device ED including a pixel electrode PE, a light emitting layer EL, and a common electrode CE, a driving transistor DT for driving the light emitting device ED, and a driving transistor a switching transistor SWT controlling the connection between the gate electrode of the DT and the data line DL, and a storage capacitor Cst connected between the gate electrode of the driving transistor DT and the pixel electrode PE have.

Referring to FIG. 6 , transistors DT, SWT, and SENT and a capacitor Cst may be formed on a substrate SUB, and light emitting devices ED may be formed. An encapsulation layer ENCAP may be formed on the common electrode CE of the light emitting devices ED. The encapsulation layer ENCAP may prevent oxygen or moisture from penetrating into the light emitting devices ED.

Referring to FIG. 6 , in the display panel 110 of the touch display device 100 according to embodiments of the present disclosure, a plurality of touch electrodes TE disposed on the encapsulation layer ENCAP may be disposed. Also, in the display panel 110 of the touch display device 100 according to embodiments of the present disclosure, a color filter CF may be disposed on the encapsulation layer ENCAP.

In addition, in the display panel 110 of the touch display device 100 according to embodiments of the present disclosure, the vertical position between the touch electrode TE and the color filter CF positioned on the bongjingz ENCAP may vary. can be designed For example, the color filter CF may be disposed on the encapsulation layer ENCAP, and the touch electrode TE may be disposed on the color filter CF. As another example, the touch electrode TE may be disposed on the encapsulation layer ENCAP, and the color filter CF may be disposed on the touch electrode TE.

Hereinafter, a cross-sectional structure of the display panel 110 will be described in more detail with reference to FIG. 6 . In FIG. 6 , the sensing transistor SENT is omitted for convenience of description. Also, in FIG. 6 , the source electrode S1 of the driving transistor DT is electrically connected to the pixel electrode PE, and the drain electrode D2 of the switching transistor SWT is connected to the data line DL. Assume

Referring to FIG. 6 , shield layers SHD may be disposed on a substrate SUB.

A buffer layer BUF may be disposed on the shield layers SHD.

A switching transistor SWT and a driving transistor DT may be formed on the buffer layer BUF. The sensing transistor SENT may also be formed on the buffer layer BUF.

The semiconductor layer ACT1 of the driving transistor DT and the semiconductor layer ACT2 of the switching transistor SWT may be formed on the buffer layer BUF.

The semiconductor layer ACT1 of the driving transistor DT includes a channel part CH1, a source connection part CS1 positioned on one side of the channel part CH1, and a drain connection part positioned on the other side of the channel part CH1. CD1). Here, the source connection part CS1 and the drain connection part CD1 may be portions in which a semiconductor material is conductive.

The semiconductor layer ACT2 of the switching transistor SWT includes a channel part CH2, a source connection part CS2 positioned on one side of the channel part CH2, and a drain connector part positioned on the other side of the channel part CH2. CD2). Here, the source connection part CS2 and the drain connection part CD2 may be conductive parts of a semiconductor material.

One of the shield layers SHD formed under the buffer layer BUF is a channel portion CH1 of the semiconductor layer ACT1 of the driving transistor DT and a channel portion of the semiconductor layer ACT2 of the switching transistor SWT. It may overlap with at least one of (CH2). Accordingly, at least one of the channel portion CH1 of the semiconductor layer ACT1 of the driving transistor DT and the channel portion CH2 of the semiconductor layer ACT2 of the switching transistor SWT is light (external light or internal light) By blocking exposure to , a change in channel characteristics can be prevented.

A gate insulating layer GI may be disposed on the semiconductor layer ACT1 of the driving transistor DT and the semiconductor layer ACT2 of the switching transistor SWT. The gate electrode G1 of the driving transistor DT and the gate electrode G2 of the switching transistor SWT may be positioned on the gate insulating layer GI. The gate electrode G1 of the driving transistor DT may overlap the channel portion CH1 of the semiconductor layer ACT1 of the driving transistor DT. The gate electrode G2 of the switching transistor SWT may overlap the channel portion CH2 of the semiconductor layer ACT2 of the switching transistor SWT.

A first interlayer insulating layer ILD1 may be disposed on the gate electrode G1 of the driving transistor DT and the gate electrode G2 of the switching transistor SWT.

A source electrode S1 and a drain electrode D1 of the driving transistor DT may be disposed on the first interlayer insulating layer ILD1 . The source electrode S1 of the driving transistor DT may electrically contact the source connection part CS1 in the semiconductor layer ACT1 of the driving transistor DT through a contact hole of the first interlayer insulating layer ILD1 . The drain electrode D1 of the driving transistor DT may electrically contact the drain connection part CD1 in the semiconductor layer ACT1 of the driving transistor DT through a contact hole of the first interlayer insulating layer ILD1.

A source electrode S2 and a drain electrode D2 of the switching transistor SWT may be disposed on the first interlayer insulating layer ILD1 . The source electrode S2 of the switching transistor SWT may electrically contact the source connection part CS2 in the semiconductor layer ACT2 of the switching transistor SWT through a contact hole of the first interlayer insulating layer ILD1 . The drain electrode D2 of the switching transistor SWT may be in electrical contact with the drain connection portion CD2 in the semiconductor layer ACT2 of the switching transistor SWT through a contact hole of the first interlayer insulating layer ILD1 .

Referring to FIG. 6 , the base line EVSL may be disposed on the first interlayer insulating layer ILD1 . The base line EVSL may be connected to the shield layer SHD positioned under the base line EVSL through a contact hole of the first interlayer insulating layer ILD1 and the buffer layer BUF. Due to the connection between the base line EVSL and the shield layer SHD, the resistance of the base line EVSL may decrease.

A passivation layer PAS may be disposed to cover the source electrodes S1 and S2 , the drain electrodes D1 and D2 , and the base line EVSL formed on the first interlayer insulating layer ILD1 .

An overcoat layer OC may be disposed on the passivation layer PAS. The overcoat layer OC may be disposed at a position overlapping the emission area EA of the subpixel SP. The overcoat layer OC may be disposed in a dam shape even at a position that does not overlap the light emitting area EA.

The pixel electrode PE may be disposed on the overcoat layer OC at a point defined as the emission area EA of the subpixel SP. The pixel electrode PE may be electrically connected to the source electrode S1 of the driving transistor DT through contact holes of the overcoat layer OC and the passivation layer PAS.

A bank BANK for defining the emission area EA of the subpixel SP may be disposed on the pixel electrode PE. A part of the bank BANK is opened to expose a part of the pixel electrode PE. An open area of the bank BANK may correspond to the emission area EA.

The emission layer EL may be disposed on the pixel electrode PE exposed to the open area of the bank BANK. A common electrode CE may be disposed on the emission layer EL.

Referring to FIG. 6 , a contact hole CNT for connection to the base line EVSL is formed in the passivation layer PAS. In the vicinity of the contact hole CNT of the passivation layer PAS for electrical connection between the common electrode CE and the base line EVSL, the common electrode CE may be cut off or a through hole (hole) may exist. The contact hole CNT of the passivation layer PAS for electrical connection between the common electrode CE and the base line EVSL includes a relatively large first contact hole CNT1 and a relatively small second contact hole CNT2. may include

The first contact hole CNT1 of the passivation layer PAS for electrical connection between the common electrode CE and the base line EVSL is electrically connected between the pixel electrode PE and the source electrode S1 of the driving transistor DT. It has a much larger width (diameter of the hole when viewed from above) than the contact hole of the passivation layer (PAS) for .

A portion of the base line EVSL may be relatively widely exposed through the first contact hole CNT1 formed in the passivation layer PAS. A portion of the base line EVSL may be slightly exposed through the second contact hole CNT2 formed in the passivation layer PAS.

A portion of the common electrode CE may be electrically connected to a portion of the base line EVSL through the first contact hole CNT1 of the passivation layer PAS. Another portion of the common electrode CE may be electrically connected to another portion of the base line EVSL through the second contact hole CNT2 of the passivation layer PAS.

When another portion of the common electrode CE is electrically connected to another portion of the base line EVSL through the second contact hole CNT2 of the passivation layer PAS, it may be connected through the reflector RP. Here, the reflective plate RP may be a layer formed of the same material as the pixel electrode PE when the pixel electrode PE is formed.

Referring to FIG. 6 , an encapsulation layer ENCAP may be disposed on the common electrode CE. The encapsulation layer ENCAP may block penetration of external moisture or oxygen into the light emitting device ED, which is vulnerable to external moisture or oxygen. The encapsulation layer ENCAP may be formed of one layer or a plurality of layers.

For example, the encapsulation layer ENCAP may include one or more inorganic encapsulation layers and one or more organic encapsulation layers.

As a specific example, the encapsulation layer ENCAP may be configured by sequentially stacking a first inorganic encapsulation layer, an organic encapsulation layer, and a second inorganic encapsulation layer. The first inorganic encapsulation layer may be formed on the substrate SUB on which the common electrode CE is formed to be closest to the light emitting device ED. For example, the first inorganic encapsulation layer may be formed of an inorganic insulating material capable of low-temperature deposition, such as silicon nitride (SiNx), silicon oxide (SiOx), silicon oxynitride (SiON), or aluminum oxide (Al2O3). The first inorganic encapsulation layer may prevent the light emitting layer EL including an organic material vulnerable to a high temperature atmosphere from being damaged during the deposition process. The organic encapsulation layer may have a smaller area than the first inorganic encapsulation layer. The organic encapsulation layer may be formed to expose both ends of the first inorganic encapsulation layer. The organic encapsulation layer may serve as a buffer for relieving stress between layers due to bending of the touch display device 100 , which may be an organic light emitting display device, and may serve to enhance planarization performance. For example, the organic encapsulation layer may be formed of an organic insulating material such as acrylic resin, epoxy resin, polyimide, polyethylene, or silicon oxycarbon (SiOC). The second inorganic encapsulation layer may be formed on the substrate SUB on which the organic encapsulation layer is formed to cover upper surfaces and side surfaces of the organic encapsulation layer and the first inorganic encapsulation layer, respectively. The second inorganic encapsulation layer minimizes or blocks penetration of external moisture or oxygen into the first inorganic encapsulation layer and the organic encapsulation layer.

Referring to FIG. 6 , a touch buffer layer T-BUF may be disposed on the encapsulation layer ENCAP. The touch buffer layer T-BUF may be designed such that the separation distance between the touch sensor metal and the common electrode CE of the light emitting device ED maintains a predetermined minimum separation distance (eg, 5 μm). Accordingly, it is possible to reduce or prevent a parasitic capacitance formed between the touch sensor metal and the common electrode CE of the light emitting element ED, and thereby, it is possible to prevent a decrease in touch sensitivity due to the parasitic capacitance. In addition, the touch buffer film (T-BUF) is a chemical (developer or etchant, etc.) used in the manufacturing process of the touch sensor metal disposed on the touch buffer film (T-BUF) or moisture from the outside containing organic matter. Penetration into the light emitting layer EL may be blocked.

The touch buffer film (T-BUF) can be formed at a low temperature below a certain temperature (eg, 100 degrees (℃)) to prevent damage to the light emitting layer (EL) containing organic materials that are vulnerable to high temperatures, and has a low dielectric constant of 1 to 3 It is formed of an organic insulating material having For example, the touch buffer layer T-BUF may be formed of an acrylic-based, epoxy-based, or siloxan-based material. The touch buffer film T-BUF, which is made of an organic insulating material and has planarization performance, is formed on the touch buffer film T-BUF and damages each encapsulation layer in the encapsulation layer ENCAP due to the bending of the touch display device 100 . It is possible to prevent the cracking of the touch sensor metal.

The above-described touch buffer layer T-BUF is not essential and may be omitted in some cases.

The touch electrode TE may be disposed on the touch buffer layer T-BUF or may be disposed directly on the encapsulation layer ENCAP. The touch electrode TE shown in FIG. 6 is shown as a mesh type.

A second interlayer insulating layer ILD2 may be disposed on the touch electrode TE. A color filter CF may be disposed on the second interlayer insulating layer ILD2 , and a black matrix may also be disposed along with the color filter CF. Here, the color filter CF and the black matrix may be selectively disposed.

A protective layer PAC may be disposed on the color filter CF. The protective layer PAC may be coupled to the cover glass CG through the adhesive layer OCA. An anti-reflection film ARF may be disposed on the cover glass CG. Here, the anti-reflection film ARF may be a film that may be selectively disposed.

6 is a cross-sectional view of the display area DA. In the vicinity of the boundary of the non-display area NDA of the display area DA of the display panel 110 , the encapsulation layer ENCAP may include an outer inclined surface. The display panel 110 further includes a dam part positioned in the area where the outer slope of the encapsulation layer ENCAP ends, and a pad part positioned in the non-display area NDA and positioned outside the dam part, etc. can do. The touch routing wire TRW may descend along the outer slope of the encapsulation layer ENCAP, pass the upper part of the dam part, and may be electrically connected to the pad part.

The dam unit may include one or more dams. When the liquid organic encapsulation layer is dropped on the display area DA, the liquid organic encapsulation layer collapses in the non-display area NDA to invade the pad part. it can be prevented This effect may be greater when the dam part includes a plurality of dams.

The dam forming material layer of the dam part may include the same material as the bank BANK for separating the subpixels SP from each other, or the same material as the spacer for maintaining the interlayer spacing. The dam unit may have a structure in which the first inorganic encapsulation layer and/or the second inorganic encapsulation layer are stacked on the dam-forming material layer.

Referring to FIG. 6 , the base line EVSL may be positioned below the common electrode CE and may be electrically connected to the common electrode CE.

Referring to FIG. 6 , at least one of the plurality of ground lines EVSL may have a potential difference from an adjacent data line DL. Alternatively, at least one of the plurality of ground lines EVSL is one electrode (in the case of FIG. 6 , a drain electrode) connected to an adjacent data line DL among the source electrode S2 and the drain electrode D2 of the adjacent switching transistor SWT. (D2)) and may have a potential difference.

Referring to FIG. 6 , a passivation layer PAS as at least one insulating layer may be disposed on the plurality of ground lines EVSL. The passivation layer PAS corresponding to at least one insulating layer has a plurality of contact holes CNT1 and CNT2, and the common electrode CE has a plurality of ground wirings exposed through the plurality of contact holes CNT1 and CNT2. EVSL) and may be electrically connected.

Each of the plurality of ground lines EVSL may be positioned on the same layer as at least one of the source electrode S2 , the drain electrode D2 , and the gate electrode G2 of the switching transistor SWT included in the adjacent subpixel SP. can In the example of FIG. 6 , each of the plurality of ground lines EVSL may be located on the same layer as the source electrode S2 and the drain electrode D2 of the switching transistor SWT included in the adjacent subpixel SP, The same material as the source electrode S2 and the drain electrode D2 of the switching transistor SWT may be included.

Referring to FIG. 6 , the area X may be an area between the light emitting area EA of the illustrated subpixel SP and the light emitting area EA of another subpixel SP. When the touch display device 100 according to embodiments of the present disclosure is a transparent display, the region X may be a transparent region (or also referred to as a transmissive region).

During touch driving, various capacitances Cf, Cp, and Cc may be formed in the display panel 110 . Hereinafter, various capacitances Cf, Cp, and Cc formed in the display panel 110 will be described with reference to FIG. 7 .

7 and 8 are diagrams illustrating common electrode ripple noise (CE ripple noise) induced in the common electrode (CE) by touch driving in the display panel 110 of the touch display device 100 according to embodiments of the present disclosure; It is a diagram for explaining the effect of common electrode ripple noise.

Referring to FIG. 7 , the touch driver TDRV may include one or more preamplifiers PRE-AMP. The pre-amplifier (PRE-AMP) includes a non-inverting input terminal (IN) to which the touch driving signal (TDS) is input, an inverting input terminal (INR) electrically connected to the touch electrode (TE), an output terminal (OUT) for outputting an output signal, and a feedback capacitor Cfb connected between the non-inverting input terminal IN and the output terminal OUT.

The touch driving signal TDS may be a signal with a variable voltage level, and may have a predetermined frequency and amplitude.

Referring to FIGS. 6 and 7 , when a screen is touched using a user's finger or a pen, a capacitance Cf may be formed between a finger or a pen and the touch electrode TE. This capacitance (Cf) is called a finger capacitance (Cf).

The touch sensing circuit 150 of the touch display device 100 may sense touch coordinates based on a change in the finger capacitance Cf of each touch electrode TE.

6 and 7 , the common electrode CE and the touch electrode TE may be coupled in a capacitive manner. Accordingly, when a potential difference occurs between the common electrode CE and the touch electrode TE, a parasitic capacitance Cp may be formed between the common electrode CE and the touch electrode TE.

6 and 7 , the base line EVSL may be spaced apart from the adjacent data line DL and disposed parallel to the data line DL. Also, the ground line EVSL may be disposed adjacent to the switching transistor SWT having an electrode (a drain electrode D2 or a source electrode S2) connected to the data line DL.

According to this structure, the base line EVSL to which the base voltage EVSS is applied and the data line DL to which the data signal Vdata is applied may be coupled in a capacitive manner. Alternatively, the ground line EVSL to which the ground voltage EVSS is applied and one electrode (a drain electrode or a source electrode) of the switching transistor SWT may be coupled in a capacitive manner. Here, the data line DL may be electrically connected to one electrode (a drain electrode or a source electrode) of the switching transistor SWT.

Accordingly, a coupling capacitance Cc may be formed between the base line EVSL and the data line DL. In other words, a coupling capacitance Cc may be formed between the base line EVSL and one electrode (a drain electrode or a source electrode) of the switching transistor SWT.

6 to 8 , when the touch driving signal TDS of which the voltage level is changed is applied to the touch electrode TE, the common electrode CE at each timing when the voltage level of the touch driving signal TDS is changed. Ripple noise may occur. Hereinafter, ripple noise generated in the common electrode CE due to a voltage level change of the touch driving signal TDS is referred to as common electrode ripple noise.

Referring to FIG. 8 , when the voltage level of the touch driving signal TDS rises, the common electrode ripple noise has a positive polarity (or a negative polarity), and when the voltage level of the touch driving signal TDS falls, the common electrode ripple noise is common. The electrode ripple noise may have a negative polarity (or a positive polarity).

Accordingly, a positive peak and a negative peak may occur in the base voltage EVSS applied to the common electrode CE based on the base voltage value. The positive peak and the negative peak are caused by the common electrode ripple noise, and may be generated at a timing when the voltage level of the touch driving signal TDS is rising or a timing when the voltage level of the touch driving signal TDS is rising.

6 and 7 , the common electrode ripple noise generated in the common electrode CE due to a voltage level change of the touch driving signal TDS causes the data line DL capacitively coupled to the base line EVSL. ) can be transferred. Here, the data line DL may be connected to a drain electrode or a source electrode of the switching transistor SWT.

As the common electrode ripple noise is transferred to the data line DL, positive and negative peaks corresponding to the common electrode ripple noise are generated in the data signal Vdata applied to the data line DL.

According to the timing of the scan signals SCAN1, SCAN2, SCAN3, and SCAN4, some of the data voltages V1, V2, V3, and V4 used for pixel charging (V3, V4) remain (V3, V4) due to common electrode ripple noise. V1, V2) and the voltage value may be different. Due to this, a pixel charging difference may occur, which may cause an abnormality in which horizontal lines that are brighter or darker than the surrounding area are visible, leading to image quality degradation.

9 is a diagram illustrating touch driving in a non-inversion driving method of the touch display device 100 according to embodiments of the present disclosure.

Referring to FIG. 9 , the touch driving units TDRV1 to TDRV7 included in the touch driving circuit 160 may receive touch driving signals TDS and supply them to the touch electrodes TE to perform touch driving. .

Each of the touch drivers TDRV1 to TDRV7 may include one or more preamplifiers PRE-AMP. In addition, each of the touch drivers TDRV1 to TDRV7 may include a multiplexer circuit that selects one or more of the plurality of touch electrodes TE and connects them to one or more pre-amplifiers PRE-AMP.

In the first driving period, the touch driving units TDRV1 to TDRV7 supply the touch driving signal TDS to the touch electrodes TE arranged in the first touch electrode row or the touch driving signal to all the touch electrodes TE. The TDS may be supplied and the touch electrodes TE arranged in the first touch electrode row may be sensed.

In the second driving period, the touch driving units TDRV1 to TDRV7 supply the touch driving signal TDS to the touch electrodes TE arranged in the second touch electrode row or the touch driving signal to all the touch electrodes TE. The TDS may be supplied and the touch electrodes TE arranged in the second touch electrode row may be sensed.

In the third driving period, the touch driving units TDRV1 to TDRV7 supply the touch driving signal TDS to the touch electrodes TE arranged in the third touch electrode row or the touch driving signal to all the touch electrodes TE. The TDS may be supplied and the touch electrodes TE arranged in the third touch electrode row may be sensed.

In the fourth driving period, the touch driving units TDRV1 to TDRV7 supply the touch driving signal TDS to the touch electrodes TE arranged in the fourth touch electrode row or the touch driving signal to all the touch electrodes TE. TDS may be supplied and the touch electrodes TE arranged in the fourth touch electrode row may be sensed.

Referring to FIG. 9 , the touch driving signals TDS output from each of the touch driving units TDRV1 to TDRV7 may have the same phase. That is, the touch driving signals TDS output from each of the touch driving units TDRV1 to TDRV7 may have the same polarity at the same time.

Accordingly, the touch driving signal TDS applied to the touch electrodes TE may have the same phase. That is, the polarities of the touch driving signals TDS applied to the touch electrodes TE at the same time may be the same.

Accordingly, the polarity change of the common electrode ripple noise generated in the common electrode CE by the touch driving signals TDS output from each of the touch drivers TDRV1 to TDRV7 is also the same. Accordingly, the ground voltage EVSS applied to the common electrode CE is greatly affected by the common electrode ripple noise, and the light emitting device ED may not operate normally. In addition, since the base line EVSL connected to the common electrode CE is coupled to the data line DL, the trough electrode ripple noise may also adversely affect the data line DL, so that the pixel charging may not be normally performed. .

Hereinafter, methods for preventing or minimizing common electrode ripple noise from occurring in the common electrode CE despite a voltage level change of the touch driving signal TDS are presented.

Hereinafter, a method of removing common electrode ripple noise from the common electrode CE using an inversion driving method will be described with reference to FIGS. 10 and 11 . A method of minimizing the influence of common electrode ripple noise using a driving region division method will be described with reference to FIGS. 12 and 13 . A method of minimizing an influence on a display frame by common electrode ripple noise by using a driving frequency adjustment method will be described with reference to FIGS. 14 and 15 . A method of blocking a phenomenon in which common electrode ripple noise distorts the data signal Vdata using a coupling blocking method will be described with reference to FIGS. 16 and 17 .

10 is a diagram illustrating a column inversion type touch driving for removing common electrode ripple noise in the touch display device 100 according to embodiments of the present disclosure. FIG. 11 is a diagram illustrating touch driving in a dot inversion method for removing common electrode ripple noise in the touch display device 100 according to embodiments of the present disclosure.

10 and 11 , the touch display device 100 according to embodiments of the present disclosure may remove common electrode ripple noise from the common electrode CE using an inversion driving method.

10 and 11 , the plurality of touch electrodes TE disposed on the display panel 110 include a first touch electrode TE1 and a second touch electrode TE1 adjacent to the first touch electrode TE1 in a row direction. TE2), a third touch electrode TE3 adjacent to the first touch electrode TE1 in a column direction, and a fourth touch electrode TE4 adjacent to the second touch electrode TE2 in a column direction may be included.

The first touch electrode TE1 and the second touch electrode TE2 are adjacent to each other in the row direction and included in the first touch electrode row, and the third touch electrode TE3 and the fourth touch electrode TE4 are disposed in the row direction. They may be adjacent to each other and may be included in the row of the second touch electrode. The first touch electrode TE1 and the third touch electrode TE3 are adjacent to each other in the column direction and included in the first touch electrode column, and the second touch electrode TE2 and the fourth touch electrode TE4 are connected to each other in the column direction. It may be adjacent to and included in the second touch electrode column.

10 and 11 , when the touch driving circuit 160 supplies the first touch driving signal TDS1 whose voltage level is changed to the first touch electrode TE1, the first touch driving signal TDS1 The second touch driving signal TDS2 having the same frequency as , changing the voltage level and having a polarity reversed from that of the first touch driving signal TDS1 may be supplied to the second touch electrode TE2 .

10 and 11 , the first touch driving unit TDRV1 of the touch driving circuit 160 may supply the first touch driving signal TDS1 whose voltage level is changed to the first touch electrode TE1 . When the first touch driving unit TDRV1 of the touch driving circuit 160 supplies the first touch driving signal TDS1 to the first touch electrode TE1 , the second touch driving unit TDRV2 of the touch driving circuit 160 is The second touch driving signal TDS2 having the same frequency as the first touch driving signal TDS1 , the voltage level being changed, and having a polarity inverted compared to the first touch driving signal TDS1 is used as the second touch electrode TE2 . can supply

10 and 11 , the first touch driving unit TDRV1 receives the first touch driving signal TDS1 and supplies the input first touch driving signal TDS1 to the first touch electrode TE1, A preamplifier PRE-AMP for detecting a signal from the first touch electrode TE1 may be included.

The second touch driving unit TDRV2 receives the second touch driving signal TDS2 , and supplies the input second touch driving signal TDS2 to the second touch electrode TE2 , and a signal from the second touch electrode TE2 . It may include a pre-amplifier (PRE-AMP) for detecting .

The fact that the polarities of the first touch driving signal TDS1 and the second touch driving signal TDS2 applied to each of the first and second touch electrodes TE1 and TE2 adjacent in the row direction are opposite means that the first touch It may mean that the phase between the driving signal TDS1 and the second touch driving signal TDS2 is opposite to each other. The opposite phase between the first touch driving signal TDS1 and the second touch driving signal TDS2 means that the phase difference between the first touch driving signal TDS1 and the second touch driving signal TDS2 is half a wavelength. can be

Accordingly, when the voltage level of the first touch driving signal TDS1 rises, the voltage level of the second touch driving signal TDS2 falls. When the voltage level of the first touch driving signal TDS1 falls, the voltage level of the second touch driving signal TDS2 rises.

Accordingly, the polarity of the common electrode ripple noise generated in the ground voltage EVSS applied to the common electrode CE due to the voltage level change of the first touch driving signal TDS1 and the voltage of the second touch driving signal TDS2 The polarities of the common electrode ripple noise generated in the ground voltage EVSS applied to the common electrode CE due to the level change are opposite to each other.

Accordingly, the common electrode ripple noise generated in the base voltage EVSS applied to the common electrode CE due to the voltage level change of the first touch driving signal TDS1 and the voltage level fluctuation of the second touch driving signal TDS2 The common electrode ripple noise generated in the ground voltage EVSS applied to the common electrode CE may be canceled by canceling each other. Accordingly, the voltage state of the common electrode CE may be maintained as the ground voltage EVSS in the form of a constant DC voltage.

As described above, the touch display device 100 may remove common electrode ripple noise from the common electrode CE by using the inversion driving method.

Assuming that the touch electrodes TE adjacent in the row direction are simultaneously driven at the same point in time, the inversion driving method includes the column inversion driving method of FIG. 10 and the dot inversion driving method of FIG. 11 ( Dot Inversion Driving) may be included.

On the other hand, when it is assumed that the touch electrodes TE adjacent in the column direction are simultaneously driven at the same time, the inversion driving method is a row inversion driving method and a dot inversion driving method. ) method, and the like. In this specification, rows and columns should be viewed as relative.

Referring to FIG. 10 , the touch driving circuit 160 may perform thermal inversion driving. That is, the touch driving circuit 160 may supply the touch driving signals TDS having opposite polarities to two touch electrode columns adjacent in the row direction.

Referring to FIG. 10 , the touch driving circuit 160 supplies the first touch driving signal TDS1 to the first touch electrode TE1 through the first touch routing wiring TRW1 and the second touch routing wiring TRW2. When supplying the second touch driving signal TDS2 having an inverted polarity compared to the first touch driving signal TDS1 to the second touch electrode TE2 through The third touch driving signal TDS3 having the same frequency as TDS1 and having the same polarity as the first touch driving signal TDS1 is supplied to the third touch electrode TE3 through the third touch routing wire TRW3, The fourth touch driving signal TDS4 having the same frequency as the second touch driving signal TDS2 and having the same polarity as the second touch driving signal TDS2 is applied to the fourth touch electrode ( TE4) can be supplied.

Referring to FIG. 10 , due to polarity inversion between the first and third touch driving signals TDS1 and TDS3 and the second and fourth touch driving signals TDS2 and TDS4, the first and third touch driving signals TDS1 and TDS4 The common electrode ripple noise RN1 generated at the common electrode CE by TDS3 and the common electrode ripple noise RN2 generated at the common electrode CE by the second touch driving signal TDS2 have different polarities can have Accordingly, common electrode ripple noises having opposite polarities are canceled at the common electrode CE, and the base voltage EVSS at the common electrode CE has a DC voltage form in which the voltage level does not change.

Referring to FIG. 11 , the touch driving circuit 160 may perform dot inversion driving. That is, the touch driving circuit 160 may supply the touch driving signal TDS of opposite polarity to all the touch electrodes TE adjacent in the row direction and the column direction.

11 , the touch driving circuit 160 supplies the first touch driving signal TDS1 to the first touch electrode TE1 through the first touch routing wiring TRW1, and the second touch routing wiring ( When the second touch driving signal TDS2 having a polarity reversed from that of the first touch driving signal TDS1 is supplied to the second touch electrode TE2 through TRW2, the same frequency as that of the second touch driving signal TDS2 and a third touch driving signal TDS3 having the same polarity as the second touch driving signal TDS2 is supplied to the third touch electrode TE3 through the third touch routing wire TRW3, and the first touch driving signal A fourth touch driving signal TDS4 having the same frequency as (TDS1) and having the same polarity as the first touch driving signal TDS1 can be supplied to the fourth touch electrode TE4 through the fourth touch routing wire TRW4. have.

Referring to FIG. 11 , due to polarity inversion between the first touch driving signal TDS1 and the second touch driving signal TDS2 , the common electrode ripple generated in the common electrode CE by the first touch driving signal TDS1 The noise RN1 and the common electrode ripple noise RN2 generated in the common electrode CE by the second touch driving signal TDS2 may have different polarities.

Also, due to polarity inversion between the third touch driving signal TDS3 and the fourth touch driving signal TDS4 , the common electrode ripple noise RN3 generated in the common electrode CE by the third touch driving signal TDS3 . And, the common electrode ripple noise RN4 generated in the common electrode CE by the fourth touch driving signal TDS4 may have different polarities.

Also, due to the polarity inversion between the first touch driving signal TDS1 and the third touch driving signal TDS3 , the common electrode ripple noise RN1 generated in the common electrode CE by the first touch driving signal TDS1 . and the common electrode ripple noise RN3 generated in the common electrode CE by the third touch driving signal TDS3 may have different polarities.

Also, due to polarity inversion between the second touch driving signal TDS2 and the fourth touch driving signal TDS4 , the common electrode ripple noise RN2 generated in the common electrode CE by the second touch driving signal TDS2 . And, the common electrode ripple noise RN4 generated in the common electrode CE by the fourth touch driving signal TDS4 may have different polarities.

Accordingly, common electrode ripple noises having opposite polarities are canceled at the common electrode CE, and the base voltage EVSS at the common electrode CE has a DC voltage form in which the voltage level does not change.

12 and 13 are diagrams for explaining a driving region division method for removing common electrode ripple noise in the touch display device 100 according to embodiments of the present disclosure.

In the touch display device 100 according to the embodiments of the present disclosure, when the data driving circuit 120 outputs the data signals Vdata for image display to the plurality of data lines DL, the touch driving circuit 160 ) may output the first touch driving signal TDS1 and the second touch driving signal TDS2 to the adjacent first and second touch electrodes TE1 and TE2 , respectively.

That is, the touch display device 100 according to embodiments of the present disclosure may perform touch driving while driving the display. In other words, the touch display device 100 according to embodiments of the present disclosure may sense a touch while driving a display for displaying an image.

On the other hand, in the touch display device 100 according to embodiments of the present disclosure, even when common electrode ripple noise occurs at any one point of the common electrode CE, the generated common electrode ripple noise has a significant effect on display driving. It is possible to provide a method of dividing the driving area that can prevent this from occurring.

Referring to FIG. 12 , when the touch driving circuit 160 supplies the first touch driving signal TDS1 and the second touch driving signal TDS2 to the first and second touch electrodes TE1 and TE2 , respectively. , the touch driving circuit 160 is included in the first touch electrode row TER1 including the first touch electrode TE1 and the second touch electrode TE2 and another touch electrode row TER3 spaced apart in the column direction. The touch driving signal TDS is not supplied to the touch electrodes TE. In this case, for driving the display, the gate driving circuit 130 may output a gate signal having a turn-on voltage level to one or more gate lines GL overlapping other touch electrode rows TER3 .

Referring to Fig. 12, it will be described in more detail. For convenience of description, it is assumed that four touch electrode rows TER1 , TER2 , TER3 , and TER4 exist in the display panel 110 . At least one data driver DDRV and at least one touch driver TDRV may be integrated to be implemented as one integrated integrated circuit 200 .

At the first time t1 , the area in which the third touch electrode row TER3 is disposed is the touch driving area TDA, and the subpixels SP overlapping the first touch electrode row TER1 are disposed. The area is the display driving area DDA.

At the second time t2 , the area in which the fourth touch electrode row TER4 is disposed is the touch driving area TDA, and the subpixels SP overlapping the second touch electrode row TER2 are disposed. The area is the display driving area DDA.

At the third time t3, the area in which the first touch electrode row TER1 is disposed is the touch driving area TDA, and the subpixels SP overlapping the third touch electrode row TER3 are disposed. The area is the display driving area DDA.

Referring to FIG. 13 , when common electrode ripple noise is generated in the common electrode CE due to a voltage level change of the touch driving signal TDS in the touch driving area TDA, the common electrode ripple noise is transmitted to the base line EVSL. will move along

Since the base line EVSL has a predetermined resistance R, when the common electrode ripple noise is transmitted to the display driving area DDA away from the touch driving area TDA through the base line EVSL, a common Electrode ripple noise can be very attenuated. Accordingly, the common electrode ripple noise of which the signal strength is greatly attenuated does not significantly affect driving of the display in the display driving area DDA.

14 and 15 are diagrams for explaining a driving method for removing common electrode ripple noise in the touch display device 100 according to embodiments of the present disclosure.

Referring to FIG. 14 , in the touch display device 100 according to embodiments of the present disclosure, the frequency FREQ_TDS of the touch driving signal TDS may be an integer multiple of the display frame frequency FREQ_FRAME.

The display frame frequency FREQ_FRAME may be an inverse number of a period in which the scan signal SCAN is applied to the same scan signal line SCL. The frequency FREQ_TDS of the touch driving signal TDS may be a reciprocal of a pulse period of the touch driving signal TDS.

The common electrode ripple noise includes a peak voltage at which the voltage of the common electrode CE increases in a positive direction when the voltage level of the touch driving signal TDS rises from a low level voltage to a high level voltage, and the touch driving signal TDS. The voltage level of the common electrode CE may include a peak voltage in which the voltage of the common electrode CE increases in a negative direction when the voltage level of the voltage falls from the high level voltage to the low level voltage.

The first touch driving signal TDS1 and the second touch driving signal TDS2 respectively applied to the first and second touch electrodes TE1 and TE2 adjacent in the row direction and having opposite polarities have the same frequency FREQ_TDS ) can have

For example, when the display frame frequency FREQ_FRAME is 100 Hz, the frequency FREQ_TDS of the touch driving signal TDS may be 100 KHz, which is an integer multiple of 100 Hz.

As described above, since the frequency FREQ_TDS of the touch driving signal TDS is set to be an integer multiple of the display frame frequency FREQ_FRAME, the influence of the common electrode ripple noise on the display frame may be minimized.

15 is a simulation result graph for examining the relationship between the frequency FREQ_TDS of the touch driving signal TDS and the display frame frequency FREQ_FRAME. In the simulation result graph, the X-axis is the number of display frames, and the Y-axis is the RMS (Root Mean Square) current value flowing through the light emitting device ED.

Referring to FIG. 15 , in all three simulations (Simulation 1, Simulation 2, and Simulation 3), the frequency FREQ_TDS of the touch driving signal TDS was set to 100 KHz.

Simulation 1 shows that the frequency (FREQ_TDS) of the touch driving signal (TDS) is set to 100 KHz, the display frame frequency (FREQ_FRAME) is set to 120 Hz, and the common electrode ripple noise of 423 mV is randomly generated. The current value was found.

Simulation 2 shows that the frequency (FREQ_TDS) of the touch driving signal (TDS) is set to 100 KHz, the display frame frequency (FREQ_FRAME) is set to 120 Hz, and the common electrode ripple noise of 160 mV flows to the light emitting device (ED) at random. The current value was found.

Simulation 3 shows that the frequency (FREQ_TDS) of the touch driving signal (TDS) is set to 100 KHz, the display frame frequency (FREQ_FRAME) is set to 100 Hz, and the common electrode ripple noise of 160 mV flows to the light emitting device (ED) at random. The current value was found.

Simulation 3 is a case in which the frequency FREQ_TDS of the touch driving signal TDS is an integer multiple of the display frame frequency FREQ_FRAME. That is, in simulation 3, 100 KHz, which is the frequency FREQ_TDS of the touch driving signal TDS, is 1000 times greater than 100 Hz, which is the display frame frequency FREQ_FRAME.

Accordingly, the same common electrode ripple noise is received for every display frame, so that there is little variation in influence due to the common electrode ripple noise. Accordingly, it can be seen from the results of simulation 3 that the common electrode ripple noise hardly affects the display driving, so that the deviation of the current flowing to the light emitting device ED is very small.

In simulations 1 and 2, the frequency FREQ_TDS of the touch driving signal TDS does not become an integer multiple of the display frame frequency FREQ_FRAME.

Accordingly, different degrees of common electrode ripple noise are received for every display frame, and thus, an influence deviation due to the common electrode ripple noise may be varied. Accordingly, from the results of simulations 1 and 2, it can be seen that the common electrode ripple noise does not significantly affect the display driving, and thus the current flowing to the light emitting device ED has a large deviation. It can be seen that, among simulations 1 and 2, the deviation of the current flowing to the light emitting device ED is relatively larger in Simulation 1, in which the voltage of the common electrode ripple noise is larger.

16 is a cross-sectional view of the display panel 110 for reducing the effect of common electrode ripple noise on the sub-pixel SP in the touch display device 100 according to embodiments of the present disclosure. 17 is an equivalent circuit illustrating that the common electrode ripple noise is prevented from being coupled to the data signal Vdata according to the cross-sectional view of FIG. 16 .

Comparing the cross-sectional structure of FIG. 16 with the cross-sectional structure of FIG. 6 , the cross-sectional structure of FIG. 16 has only the structures (positions, etc.) of the base wiring EVSL and the shield layer SHD changed compared to the cross-sectional structure of FIG. 6 . Other parts are almost identical. Therefore, below, content with differences from the cross-sectional structure of FIG. 6 will be mainly described.

Referring to FIG. 16 , in the display panel 110 of the touch display device 100 according to embodiments of the present disclosure, a plurality of base lines EVSL are disposed on the lowermost layer.

Referring to FIG. 16 , a plurality of insulating layers BUF1 , BUF2 , ILD1 , and PAS may exist between the plurality of ground lines EVSL and the common electrode CE. A portion of the common electrode CE may be connected to a portion of the ground line EVSL exposed through the contact hole CNT of the plurality of insulating layers BUF1 , BUF2 , ILD1 , and PAS.

Referring to FIG. 16 , the display panel 110 of the touch display device 100 according to embodiments of the present disclosure may include a shield layer SHD positioned between the base line EVSL and the common electrode CE. can

Referring to FIG. 16 , the shield layer SHD may be located above the base line EVSL and below the switching transistor SWT or the data line DL.

Referring to FIG. 16 , the shield layer SHD overlaps at least a portion of the base line EVSL, and at least a portion of one electrode (drain electrode D2 ) of the switching transistor SWT or one of the switching transistor SWT. It may overlap at least a portion of the data line DL electrically connected to the electrode (drain electrode D2 ).

Referring to FIG. 16 , the shield layer SHD may block capacitive coupling between the data line DL and the base line EVSL. The shield layer SHD may block capacitive coupling between one electrode (drain electrode D2 ) of the switching transistor SWT and the base line EVSL.

Therefore, referring to FIGS. 16 and 17 , even if the common electrode ripple noise generated in the common electrode CE is transmitted to the base line EVSL, the common electrode ripple noise is transmitted from the base line EVSL to the data line DL or Transmission to one electrode (drain electrode D2) of the switching transistor SWT can be prevented.

16 and 17 , the formation of the coupling capacitance Cc between the base line EVSL and the data line DL may be prevented. Formation of the coupling capacitance Cc between the ground line EVSL and one electrode (drain electrode D2 ) of the switching transistor SWT may be prevented.

Referring to FIG. 16 , the shield layer SHD may be one of the first plate PLT1 and the second plate PLT2 constituting the storage capacitor Cst ( PLT2 ).

The cross-sectional structure of FIG. 16 will be briefly described again.

Referring to FIG. 16 , the touch display device 100 according to embodiments of the present disclosure may include a plurality of data lines DL, a plurality of sub-pixels SP, and an encapsulation layer ENCAP.

Each of the plurality of subpixels SP includes a light emitting device ED including a pixel electrode PE, a light emitting layer EL, and a common electrode CE, a driving transistor DT for driving the light emitting device ED, and a driving transistor A switching transistor SWT that controls the connection between the gate electrode G1 of the DT and the data line DL, and a storage capacitor connected between the gate electrode G1 and the pixel electrode PE of the driving transistor DT ( Cst) and the like.

Referring to FIG. 16 , the encapsulation layer ENCAP may be disposed on the common electrode CE. The plurality of touch electrodes TE corresponding to the touch sensor may be disposed on the encapsulation layer ENCAP.

Referring to FIG. 16 , the plurality of ground lines EVSL may be positioned below the common electrode CE and may be electrically connected to the common electrode CE.

Referring to FIG. 16 , the plurality of shield layers SHD may be positioned above the plurality of ground lines EVSL and may be positioned below the switching transistor SWT or the data line DL.

Referring to FIG. 16 , each of the plurality of shield layers SHD overlaps at least a portion of the base line EVSL, and at least a portion of one electrode D2 of the switching transistor SWT or one electrode of the switching transistor SWT. It may overlap at least a portion of the data line DL electrically connected to D2 .

At least a portion of one electrode D2 of the switching transistor SWT or the data line DL electrically connected to one electrode of the switching transistor SWT may not overlap the base line EVSL.

Accordingly, in each of the plurality of shield layers SHD, the data line DL electrically connected to one electrode of the switching transistor SWT or one electrode of the switching transistor SWT is capacitively coupled to the base line EVSL. can be blocked from being Accordingly, the data line DL electrically connected to one electrode of the switching transistor SWT or one electrode of the switching transistor SWT does not form the coupling capacitor Cc with the ground line EVSL.

The plurality of ground lines EVSL may be disposed to be spaced apart from the plurality of data lines DL.

Referring to FIG. 16 , the display panel 110 may further include a plurality of insulating layers PAS, ILD1, BUF1, and BUF2 disposed on the base line EVSL and having a plurality of contact holes CNT.

Here, the plurality of insulating layers PAS, ILD1, BUF1, and BUF2 include a first buffer layer BUF1 on the substrate SUB, a second buffer layer BUF2 on the first buffer layer BUF1, and a second buffer layer BUF2 on the second buffer layer BUF2. It may include a first interlayer insulating layer ILD1 and a passivation layer PAS on the first interlayer insulating layer ILD1.

The shield layer SHD may be positioned on the first buffer layer BUF1 and may be positioned under the second buffer layer BUF2 .

The common electrode CE may be in electrical contact with a portion of the base line EVSL exposed through the contact hole CNT of the plurality of insulating layers PAS, ILD1, BUF1, and BUF2.

Referring to FIG. 16 , each of the plurality of shield layers SHD may be one of the first plate PLT1 and the second plate PLT2 constituting the storage capacitor Cst PLT2 .

Referring to FIG. 16 , the plurality of touch electrodes TE may include a first touch electrode TE1 and a second touch electrode TE2 adjacent in a row direction. When the first touch driving signal TDS1 of which the voltage level is changed is applied to the first touch electrode TE1, the voltage level is changed with the same frequency as that of the first touch driving signal TDS1, and the first touch driving signal TDS1 A second touch driving signal TDS2 having a polarity inverted compared to TDS1 may be applied to the second touch electrode TE2 .

18 and 19 are examples of arrangement of the base line EVSL in the display panel 110 of the touch display device 100 according to embodiments of the present disclosure.

18 is a diagram illustrating subpixels R, W, B, and G and signal lines DVL, RVL, DL1 to DL8 and EVSL when the touch display device 100 according to embodiments of the present disclosure is an opaque display. ) is an exemplary layout for

19 is a diagram illustrating light emitting areas EA1 to EA4 and signal lines EA1 to EA4 of subpixels R, W, B, and G when the touch display device 100 according to embodiments of the present disclosure is an opaque display. DVL, RVL, EVSL). However, in FIG. 19 , the data lines DL are omitted.

Referring to FIG. 18 , the reference voltage line RVL may be disposed in a structure shared by the four sub-pixels R, W, B, and G. The driving voltage line DVL may be disposed in a structure shared by the four sub-pixels R, W, B, and G. Each of the data lines DL1 to DL8 may be disposed to correspond to one sub-pixel.

Each of the plurality of ground lines EVSL may be disposed in at least one subpixel column. For example, each of the plurality of base lines EVSL may be disposed in one subpixel column, in every two or more subpixel columns, or in one pixel column or in two or more subpixel columns. Here, one pixel column may include subpixels R, W, B, and G of four colors.

In the example of FIG. 18 , one base line EVSL may be disposed for every four sub-pixels R, W, B, and G. That is, when the four sub-pixels R, W, B, and G are referred to as one pixel, the base line EVSL may be disposed in each pixel.

Referring to FIG. 19 , the display panel 110 includes a display area DA, and the display area DA includes light-emitting areas EA1 to EA4 of a plurality of sub-pixels SP and a plurality of transmission areas TA1. , TA2, TA3).

Referring to FIG. 19 , each of the plurality of transmission areas TA1, TA2, and TA3 includes emission areas EA1 to EA4 of two or more sub-pixel columns SPC1 and SPC2, and two or more sub-pixel columns adjacent thereto ( It may be disposed between each of the light emitting areas EA1 to EA4) of SPC1 and SPC2).

Referring to FIG. 19 , the base line EVSL may be disposed between the adjacent first and second transmission areas TA1 and TA2 among the plurality of transmission areas TA1 , TA2 , and TA3 . A base line EVSL may be disposed between the adjacent second and third transmission areas TA2 and TA3 among the plurality of transmission areas TA1 , TA2 , and TA3 .

In the example of FIG. 19 , each of the plurality of base lines EVSL may be disposed in every two subpixel columns.

According to the embodiments of the present disclosure described above, it is possible to provide a self-luminous display type touch display device having a built-in touch sensor capable of providing excellent image quality and precise touch sensitivity, and a driving circuit included therein.

According to embodiments of the present disclosure, it is possible to provide a self-luminous display type touch display device having a built-in touch sensor capable of eliminating or minimizing the influence of touch driving on driving a display, and a driving circuit included therein.

According to the embodiments of the present disclosure, when a common electrode necessary for the configuration of light emitting devices for self-luminescence is included and the touch sensor is built on the common electrode, even if the voltage level of the touch driving signal for driving the touch sensor is changed , it is possible to provide a touch display device and a driving circuit capable of preventing ripple noise from being generated in the common electrode of the light emitting devices.

According to the embodiments of the present disclosure, even if ripple noise is generated in the common electrode of the light emitting devices due to the voltage level change of the touch driving signal for driving the touch sensor, the influence of the ripple noise on driving the display can be eliminated or minimized. It is possible to provide a touch display device and a driving circuit.

The above description is merely illustrative of the technical spirit of the present disclosure, and various modifications and variations will be possible without departing from the essential characteristics of the present disclosure by those of ordinary skill in the art to which the present disclosure pertains. In addition, since the embodiments disclosed in the present disclosure are for explanation rather than limiting the technical spirit of the present disclosure, the scope of the technical spirit of the present disclosure is not limited by these embodiments. The protection scope of the present disclosure should be construed by the following claims, and all technical ideas within the scope equivalent thereto should be construed as being included in the scope of the present disclosure.

Claims (22)

A plurality of light emitting devices including a plurality of data lines, a plurality of gate lines, and a plurality of subpixels, each of the plurality of light emitting devices corresponding to the plurality of subpixels, an encapsulation layer disposed on the plurality of light emitting devices, and disposed on the encapsulation layer a display panel including a plurality of touch electrodes; and
When a first touch driving signal whose voltage level is changed is supplied to the first touch electrode among the plurality of touch electrodes, the voltage level is changed with the same frequency as the first touch driving signal and is inverted compared to the first touch driving signal and a touch driving circuit for supplying a second touch driving signal having a different polarity to a second touch electrode adjacent to the first touch electrode in a row direction among the plurality of touch electrodes.
According to claim 1,
The plurality of touch electrodes further include a third touch electrode adjacent to the first touch electrode in a column direction and a fourth touch electrode adjacent to the second touch electrode in a column direction,
the third touch electrode and the fourth touch electrode are adjacent to each other in a row direction;
The touch driving circuit is
When the first touch driving signal is supplied to the first touch electrode and the second touch driving signal having a polarity inverted compared to that of the first touch driving signal is supplied to the second touch electrode,
supplying a third touch driving signal having the same frequency as the first touch driving signal and having the same polarity as the first touch driving signal to the third touch electrode;
A touch display device configured to supply a fourth touch driving signal having the same frequency as the second touch driving signal and having the same polarity as the second touch driving signal to the fourth touch electrode.
According to claim 1,
The plurality of touch electrodes further include a third touch electrode adjacent to the first touch electrode in a column direction and a fourth touch electrode adjacent to the second touch electrode in a column direction,
the third touch electrode and the fourth touch electrode are adjacent to each other in a row direction;
The touch driving circuit is
When the first touch driving signal is supplied to the first touch electrode and the second touch driving signal having a polarity inverted compared to that of the first touch driving signal is supplied to the second touch electrode,
supplying a third touch driving signal having the same frequency as the second touch driving signal and having the same polarity as the second touch driving signal to the third touch electrode;
A touch display device configured to supply a fourth touch driving signal having the same frequency as the first touch driving signal and having the same polarity as the first touch driving signal to the fourth touch electrode.
According to claim 1,
a data driving circuit for driving the plurality of data lines and a gate driving circuit for driving the plurality of gate lines;
When the data driving circuit outputs data signals for image display to the plurality of data lines,
The touch driving circuit outputs the first touch driving signal and the second touch driving signal.
5. The method of claim 4,
When the touch driving circuit supplies the first touch driving signal and the second touch driving signal to the first and second touch electrodes, respectively,
the touch driving circuit does not supply a touch driving signal to the touch electrodes included in the first touch electrode row including the first touch electrode and the second touch electrode and the second touch electrode row spaced apart in the column direction;
The gate driving circuit outputs a gate signal having a turn-on voltage level to one or more gate lines overlapping the second touch electrode row.
According to claim 1,
Each of the plurality of sub-pixels,
A light emitting device comprising a pixel electrode, a light emitting layer on the pixel electrode, and a common electrode on the light emitting layer;
a driving transistor for driving the light emitting device;
a switching transistor for switching whether to electrically connect a gate electrode of the driving transistor and the data line; and
a storage capacitor electrically connected between a gate electrode of the driving transistor and a source electrode or a drain electrode of the driving transistor;
The pixel electrode is disposed in each of the plurality of sub-pixels and is electrically connected to a source electrode or a drain electrode of the driving transistor, and the common electrode is disposed in common to the plurality of sub-pixels and has a base voltage with no change in voltage level. is authorized,
Each of the plurality of touch electrodes has a size corresponding to two or more sub-pixels,
The display panel further includes a plurality of ground wires electrically connected to the common electrode;
The plurality of base wirings are disposed to be spaced apart from the plurality of data lines.
7. The method of claim 6,
Each of the plurality of base wirings is disposed in at least one sub-pixel column.
7. The method of claim 6,
The display panel includes a display area, wherein the display area includes light emitting areas of a plurality of subpixels and a plurality of transmissive areas, each of the plurality of transmissive areas being at least two different from light emitting areas of two or more subpixel columns. disposed between the light emitting regions of the subpixel column,
A touch display device in which the base line is disposed between adjacent first and second transmissive regions among the plurality of transmissive regions.
7. The method of claim 6,
At least one of the plurality of ground wirings has a potential difference with an adjacent data line or has a potential difference with an electrode connected to an adjacent data line among the source electrode and drain electrode of the adjacent switching transistor.
7. The method of claim 6,
The plurality of ground wirings are located below the common electrode,
The display panel further includes at least one insulating layer disposed on the plurality of ground lines,
The at least one insulating layer has a plurality of contact holes,
The common electrode is electrically connected to a portion of the plurality of ground wires exposed through the plurality of contact holes.
11. The method of claim 10,
Each of the plurality of ground wirings is positioned on the same layer as at least one of a source electrode, a drain electrode, and a gate electrode of the switching transistor included in an adjacent subpixel.
11. The method of claim 10,
The display panel may be positioned above the base line, positioned below the switching transistor or the data line, overlap at least a portion of the base line, and at least a part of one electrode of the switching transistor or one electrode of the switching transistor The touch display device further comprising a shield layer overlapping at least a portion of the data line electrically connected to the.
13. The method of claim 12,
The shield layer is one of a first plate and a second plate constituting the storage capacitor.
According to claim 1,
A frequency of the first touch driving signal and the second touch driving signal is an integer multiple of a display frame frequency.
a first touch driver supplying a first touch driving signal whose voltage level is changed to a first touch electrode among the plurality of touch electrodes; and
When the first touch driving unit supplies the first touch driving signal to the first touch electrode, the voltage level is changed with the same frequency as the first touch driving signal, and the polarity is reversed compared to the first touch driving signal. and a second touch driving unit configured to supply a second touch driving signal having a second touch driving signal to a second touch electrode adjacent to the first touch electrode in a row direction among the plurality of touch electrodes.
16. The method of claim 15,
The first touch driving unit includes a preamplifier configured to receive the first touch driving signal and supply it to the first touch electrode, and detect a signal from the first touch electrode, and the second touch driving unit may include the second touch and a preamplifier configured to receive a driving signal and supply it to the second touch electrode, and detect a signal from the second touch electrode.
In the touch display device,
multiple data lines;
A light emitting device including a pixel electrode, a light emitting layer, and a common electrode, a driving transistor for driving the light emitting device, a switching transistor for controlling a connection between a gate electrode of the driving transistor and the data line, and a gate electrode of the driving transistor and the pixel a plurality of subpixels including a storage capacitor coupled between the electrodes;
an encapsulation layer disposed on the common electrode;
a plurality of touch electrodes disposed on the encapsulation layer;
a plurality of ground wires positioned below the common electrode and electrically connected to the common electrode; and
It is positioned above the plurality of ground wirings, is located below the switching transistor or the data line, overlaps at least a part of the ground wiring, and is electrically connected to at least a part of one electrode of the switching transistor or one electrode of the switching transistor. A touch display device comprising a plurality of shield layers overlapping at least a portion of a connected data line.
18. The method of claim 17,
The plurality of base wirings are disposed to be spaced apart from the plurality of data lines.
18. The method of claim 17,
Further comprising a plurality of insulating layers disposed on the plurality of ground wiring and having a plurality of contact holes,
The common electrode is in electrical contact with a portion of the plurality of ground wires exposed through the plurality of contact holes.
18. The method of claim 17,
The one electrode of the switching transistor or the data line electrically connected to the one electrode of the switching transistor does not overlap the base line.
18. The method of claim 17,
Each of the plurality of shield layers is one of a first plate and a second plate constituting the storage capacitor.
18. The method of claim 17,
The plurality of touch electrodes include first and second touch electrodes adjacent to each other in a row direction;
When a first touch driving signal having a varying voltage level is applied to the first touch electrode, the voltage level is varied with the same frequency as the first touch driving signal, and has a polarity reversed compared to that of the first touch driving signal A touch display device to which a second touch driving signal is applied to the second touch electrode.

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