KR102730123B1 - Feedback controll circuit, touch display panel and touch display device - Google Patents

Abstract

Embodiments of the present invention relate to a feedback control circuit, a touch display panel, and a device, wherein an electrical connection state between a plurality of touch electrodes can be easily controlled during a display driving period and a touch driving period by controlling a feedback control transistor that electrically connects a touch line connected to a touch electrode and a feedback voltage line. In addition, by supplying a compensation common voltage obtained by inverting and amplifying a feedback common voltage received through a feedback voltage line during the display driving period to the touch electrode, real-time compensation for the common voltage is achieved, thereby improving the picture quality of a touch display device that uses a display driving electrode as a touch electrode.

Description

FEEDBACK CONTROLL CIRCUIT, TOUCH DISPLAY PANEL AND TOUCH DISPLAY DEVICE

Embodiments of the present invention relate to a feedback control circuit, a touch display panel, and a touch display device.

As the information society develops, the demand for display devices that display images is increasing, and various types of display devices such as liquid crystal display devices and organic light-emitting display devices are being utilized.

These display devices provide a function to recognize a user's touch on the display panel and perform input processing based on the recognized touch in order to provide more diverse functions to the user.

Such a display device capable of recognizing touch can perform touch sensing using touch electrodes arranged on or built into the display panel, but there is a problem that the arrangement of the touch electrodes may thicken the display device or affect display operation.

An object of embodiments of the present invention is to provide a touch display panel and device capable of performing touch sensing using display driving electrodes built into the display panel.

An object of embodiments of the present invention is to provide a feedback control circuit, a touch display panel, and a device capable of controlling whether a touch electrode is connected during a display driving period and a touch driving period.

An object of embodiments of the present invention is to provide a feedback control circuit, a touch display panel, and a device capable of improving image quality abnormalities that may occur during a display driving period by using a display driving electrode as a touch electrode.

In one aspect, embodiments of the present invention provide a touch display device including a plurality of touch electrodes built into a panel and arranged separately from each other, a plurality of touch lines electrically connected to each of the plurality of touch electrodes, a plurality of feedback control transistors electrically connected to each of the plurality of touch lines, at least one feedback voltage line electrically connected to the plurality of feedback control transistors, and at least one driving circuit that outputs a display driving voltage to the plurality of touch lines during a display driving period, and outputs a display driving voltage compensated for according to a signal received through the at least one feedback voltage line to the plurality of touch lines.

In another aspect, embodiments of the present invention provide a touch display panel including a plurality of touch electrodes arranged separately from each other, a plurality of touch lines electrically connected to each of the plurality of touch electrodes, a plurality of feedback control transistors electrically connected to each of the plurality of touch lines, at least one feedback voltage line electrically connected to the plurality of feedback control transistors, and at least one driving circuit that outputs a display driving voltage to the plurality of touch lines during a display driving period, and outputs a display driving voltage compensated for according to a signal received through the at least one feedback voltage line to the plurality of touch lines.

In another aspect, embodiments of the present invention provide a feedback control circuit including at least one feedback voltage line disposed in a bezel area of a panel, a plurality of feedback control transistors electrically connected between the at least one feedback voltage line and each of a plurality of touch lines disposed on the panel, and a feedback control signal line electrically connected to gate electrodes of the plurality of feedback control transistors, wherein the plurality of feedback control transistors are turned on during a display driving period and turned off during a touch driving period.

According to embodiments of the present invention, by arranging a common electrode to which a common voltage is applied during a display driving period in a separate structure, touch sensing can be performed by using the common electrode as a touch electrode during a touch driving period.

According to embodiments of the present invention, it is possible to control whether a touch electrode is connected during a display driving period and a touch driving period through a feedback control transistor electrically connected between a touch line and a feedback voltage line.

According to embodiments of the present invention, by outputting a compensation common voltage that is obtained by inverting and amplifying a feedback common voltage received through a feedback voltage line during a display driving period to a touch electrode, it is possible to prevent image quality abnormalities that may occur during a display driving period depending on the separation structure of a common electrode used as a touch electrode.

FIG. 1 is a drawing showing a schematic configuration of a touch display device according to embodiments of the present invention.
FIG. 2 is a drawing showing an example of driving timing of a touch display device according to embodiments of the present invention.
FIG. 3 is a drawing showing an example of driving of a touch display device during a display driving period at the driving timing shown in FIG. 2.
FIG. 4 is a drawing showing an example of a structure in which a feedback control circuit is arranged in a touch display device according to embodiments of the present invention.
FIG. 5 is a diagram showing an example of how the feedback control circuit illustrated in FIG. 4 operates during a touch operation period.
FIG. 6 is a diagram showing an example of how the feedback control circuit illustrated in FIG. 4 operates during a display driving period.
Fig. 7 is a diagram showing an example of a compensation common voltage output by a compensation circuit during the driving process illustrated in Fig. 6.
FIG. 8 is a drawing showing another example of a structure in which a feedback control circuit is arranged in a touch display device according to embodiments of the present invention.
FIG. 9 is a drawing showing another example of a structure in which a feedback control circuit is arranged in a touch display device according to embodiments of the present invention.
FIG. 10 is a drawing showing another example of a structure in which a feedback control circuit is arranged in a touch display device according to embodiments of the present invention.

Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. When adding reference numerals to components in each drawing, the same components may have the same numerals as much as possible even if they are shown in different drawings. In addition, when describing the present invention, if it is determined that a specific description of a related known configuration or function may obscure the gist of the present invention, the detailed description may be omitted.

In addition, when describing components of the present invention, terms such as first, second, A, B, (a), (b), etc. may be used. These terms are only intended to distinguish the components from other components, and the nature, order, sequence, or number of the components are not limited by the terms. When it is described that a component is "connected," "coupled," or "connected" to another component, it should be understood that the component may be directly connected or connected to the other component, but that other components may be "interposed" between each component, or that each component may be "connected," "coupled," or "connected" through another component.

FIG. 1 is a drawing showing a schematic configuration of a touch display device (100) according to embodiments of the present invention.

Referring to FIG. 1, a touch display device (100) according to embodiments of the present invention may include a touch display panel (110), a gate driving circuit (120), a data driving circuit (130), and a controller (140). In addition, the touch display device may include a touch driving circuit (150) that drives a touch electrode (TE) disposed on the touch display panel (110).

In the touch display panel (110), a plurality of gate lines (GL) and a plurality of data lines (DL) are arranged, and a plurality of subpixels (SP) are arranged in an area where the gate lines (GL) and the data lines (DL) intersect.

Additionally, a plurality of touch electrodes (TE) may be arranged or built into the touch display panel (110), and a plurality of touch lines (TL) may be arranged to electrically connect the touch electrodes (TE) and the touch driving circuit (150) to each other.

First, when explaining the configuration for driving the display in such a touch display device (100), a gate driving circuit (120) controls the driving timing of a subpixel (SP) arranged on a touch display panel (110). Then, a data driving circuit (130) supplies a data voltage corresponding to image data to the subpixel (SP) so that the subpixel (SP) exhibits brightness corresponding to the gradation of the image data, thereby displaying an image.

Specifically, the gate driving circuit (120) is controlled by the controller (140) and sequentially outputs scan signals to a plurality of gate lines (GL) arranged on the touch display panel (110) to control the driving timing of a plurality of subpixels (SP).

The gate driving circuit (120) may include one or more gate driver integrated circuits (GDICs), and may be located on only one side of the touch display panel (110) or on both sides depending on the driving method.

Each gate driver integrated circuit (GDIC) may be connected to a bonding pad of a display panel (110) by a tape automated bonding (TAB) method or a chip on glass (COG) method, or may be implemented as a gate in panel (GIP) type and placed directly on the display panel (110), and in some cases, may be integrated and placed on the display panel (110). In addition, each gate driver integrated circuit (GDIC) may be implemented by a chip on film (COF) method mounted on a film connected to the display panel (110).

The data driving circuit (130) receives image data (or input data) from the controller (140) and converts the image data into an analog data voltage. Then, the data voltage is output to each data line (DL) in accordance with the timing at which a scan signal is applied through the gate line (GL), so that each subpixel (SP) expresses brightness according to the image data.

The data drive circuit (130) may include one or more source driver integrated circuits (SDICs).

Each source driver integrated circuit (SDIC) may include a shift register, a latch circuit, a digital-to-analog converter, an output buffer, etc.

And, each source driver integrated circuit (SDIC) may be connected to a bonding pad of the display panel (110) by a tape automated bonding (TAB) method or a chip on glass (COG) method, or may be directly placed on the display panel (110), and in some cases, may be integrated and placed on the display panel (110). In addition, each source driver integrated circuit (SDIC) may be implemented by a chip on film (COF) method, and in this case, each source driver integrated circuit (SDIC) may be mounted on a film connected to the display panel (110) and may be electrically connected to the display panel (110) through wires on the film.

The controller (140) supplies various control signals to the gate driving circuit (120) and the data driving circuit (130), and controls the operation of the gate driving circuit (120) and the data driving circuit (130).

The controller (140) causes the gate driving circuit (120) to output a scan signal according to the timing implemented in each frame, converts image data received from the outside into a data signal format used by the data driving circuit (130), and outputs the converted image data to the data driving circuit (130).

The controller (140) receives various timing signals including a vertical synchronization signal (VSYNC), a horizontal synchronization signal (HSYNC), an input data enable signal (DE, Data Enable), a clock signal (CLK), etc., from an external source (e.g., a host system) along with image data.

The controller (140) can generate various control signals using various timing signals received from the outside and output them to the gate driving circuit (120) and the data driving circuit (130).

For example, the controller (140) outputs various gate control signals (GCS) including a gate start pulse (GSP), a gate shift clock (GSC), a gate output enable signal (GOE), etc., to control the gate driving circuit (120).

Here, the gate start pulse (GSP) controls the operation start timing of one or more gate driver integrated circuits (GDICs) constituting the gate driving circuit (120). The gate shift clock (GSC) is a clock signal commonly input to one or more gate driver integrated circuits (GDICs) and controls the shift timing of the scan signal. The gate output enable signal (GOE) specifies timing information of one or more gate driver integrated circuits (GDICs).

In addition, the controller (140) outputs various data control signals (DCS) including a source start pulse (SSP), a source sampling clock (SSC), a source output enable signal (SOE), etc., to control the data driving circuit (130).

Here, the source start pulse (SSP) controls the data sampling start timing of one or more source driver integrated circuits (SDICs) constituting the data driving circuit (130). The source sampling clock (SSC) is a clock signal that controls the sampling timing of data in each of the source driver integrated circuits (SDICs). The source output enable signal (SOE) controls the output timing of the data driving circuit (130).

Such a touch display device (100) may further include a power management integrated circuit that supplies various voltages or currents to, or controls various voltages or currents to be supplied to, a touch display panel (110), a gate driving circuit (120), a data driving circuit (130), and a touch driving circuit (150).

Each subpixel (SP) is defined by the intersection of a gate line (GL) and a data line (DL), and liquid crystals or light-emitting elements may be arranged depending on the type of touch display device (100).

For example, if the touch display device (100) is a liquid crystal display device, it includes a light source device such as a backlight unit that irradiates light to the touch display panel (110), and liquid crystals are arranged in the subpixels (SP) of the touch display panel (110). Then, by adjusting the arrangement of the liquid crystals by an electric field formed as a data voltage is applied to each subpixel (SP), an image can be displayed while indicating brightness according to the image data.

As another example, if the touch display device (100) is an organic light-emitting display device, an organic light-emitting diode (OLED) is arranged in each subpixel (SP), and the current flowing to the organic light-emitting diode (OLED) is controlled according to the data voltage supplied to the subpixel (SP), and brightness according to the image data can be displayed.

Meanwhile, the touch display device (100) according to embodiments of the present invention can detect a user's touch on the touch display panel (110) by using a touch electrode (TE) and a touch driving circuit (150) included in the touch display panel (110).

For example, a touch display panel (110) may be provided with a plurality of touch electrodes (TE) and a plurality of touch lines (TL) that connect the touch electrodes (TE) to a touch driving circuit (150).

These touch electrodes (TE) may be placed on or built into the touch display panel (110). In addition, the touch electrodes (TE) may be in the form of transparent conductive electrodes without open areas or in the form of opaque meshes. In addition, the touch electrodes (TE) may be in the form of transparent electrodes with some open areas.

And, the touch electrode (TE) may be an electrode separately arranged for touch sensing, or may be an electrode used for driving the display. That is, an electrode arranged for driving the display can be used as a touch electrode (TE).

For example, if the touch display device (100) is a liquid crystal display device, the touch electrode (TE) may be a common electrode (COM) built into the touch display panel (110) and to which a common voltage (Vcom) is applied when the display is driven. Alternatively, if the touch display device (100) is an organic light-emitting display device, a cathode electrode disposed on the touch display panel (110) may be used as the touch electrode (TE).

That is, a common electrode (COM) or a cathode electrode may be arranged in a divided structure on a touch display panel (110) and used as a touch electrode (TE) for touch sensing. Accordingly, each touch electrode (TE) may be arranged to overlap with a plurality of subpixels (SP).

For convenience of explanation, embodiments of the present invention are described by way of example, in which the touch display device (100) is a liquid crystal display device, but are not limited thereto.

These touch electrodes (TE) can be connected to a touch driving circuit (150) through a touch line (TL) arranged on a touch display panel (110).

The touch driving circuit (150) may include an amplifier that outputs a touch driving signal to a touch electrode (TE) and receives a touch sensing signal from the touch electrode (TE), an integrator that integrates the output signal of the amplifier, and an analog-to-digital converter that converts the output signal of the integrator into a digital signal.

In some cases, this touch driving circuit (150) may be implemented integrally with the data driving circuit (130).

This touch driving circuit (150) can be connected one-to-one with a touch electrode (TE) and receive a touch sensing signal. That is, the touch driving circuit (150) can output a touch driving signal to the touch electrode (TE) through a touch line (TL), receive a touch sensing signal, and sense a change in self-capacitance caused by a touch.

Alternatively, the touch electrode (TE) may be arranged to be divided into a driving electrode and a sensing electrode, and the touch driving circuit (150) may be connected to each of the driving electrode and the sensing electrode. In this case, the touch driving circuit (150) may output a touch driving signal to the driving electrode and receive a touch sensing signal from the sensing electrode, and sense a change in mutual electrostatic capacitance between the driving electrode and the sensing electrode caused by a touch.

The touch driving circuit (150) converts the received touch sensing signal into digital sensing data and transmits the converted sensing data to the touch controller.

The touch controller controls the operation of the touch driving circuit (150), receives sensing data from the touch driving circuit (150), and can detect a user's touch on the touch display panel (110) based on the received sensing data.

That is, the touch controller can detect a change in self-capacitance or mutual capacitance from sensing data, and detect the presence or absence of a touch, touch coordinates, etc. based on the detected change in capacitance.

Additionally, the touch driving circuit (150) may perform touch sensing in a time-divided period separate from the display driving period, or may perform touch sensing simultaneously with the display driving period.

FIG. 2 is a diagram showing an example of the driving timing of a touch display device (100) according to embodiments of the present invention, in which display driving and touch sensing are performed in temporally divided periods.

Referring to FIG. 2, the touch display device (100) can perform touch sensing by driving a touch electrode (TE) included in a touch display panel (110) during a period (e.g., a blank period) between display driving periods based on a synchronization signal (SYNC).

For example, the touch display device (100) may perform touch sensing in a vertical blank period that exists in each image frame. Or, the touch sensing may be performed in at least some horizontal blank periods among a plurality of horizontal blank periods that exist in one image frame.

When the common electrode (COM) included in the touch display panel (110) is used as a touch electrode (TE), a common voltage (Vcom) can be applied to the touch electrode (TE) during the display driving period, and a touch driving signal can be applied to the touch electrode (TE) during the touch driving period.

These touch-driven signals can be pulse-shaped signals whose voltage magnitude changes over time.

Here, since display driving is not performed during the touch driving period, no voltage may be applied to electrodes, signal lines, etc. for display driving, or they may be in a constant voltage state. Accordingly, parasitic capacitance may be formed between the touch electrode (TE) to which the touch driving signal is applied, and the gate line (GL), and the data line (DL), and the detection performance of the touch sensing signal may be degraded due to this parasitic capacitance.

In order to prevent parasitic capacitance from being formed between the touch electrode (TE) and the gate line (GL) and data line (DL) during the touch driving period, a signal having a voltage and phase corresponding to the touch driving signal applied to the touch electrode (TE) during the touch driving period can be supplied to the gate line (GL), data line (DL), etc.

That is, as in the example illustrated in Fig. 2, a signal having the same voltage and phase as the touch driving signal can be supplied to the data line (DL) during the touch driving period. Additionally, a signal having the same voltage and phase as the touch driving signal can be output to the gate line (GL) during the touch driving period.

In this way, by supplying a signal having the same voltage and phase as the touch driving signal to the gate line (GL), data line (DL), etc. during the touch driving period, the detection performance of the touch sensing signal can be improved by preventing the formation of parasitic capacitance between the touch electrode (TE) and the signal line.

Here, during the display driving period, signals and voltages for display driving are applied to the gate line (GL) and data line (DL). Then, the display driving voltage, i.e., the common voltage (Vcom), is applied to the touch electrode (TE) through the touch line (TL).

FIG. 3 is a drawing showing an example of driving of a touch display device (100) during a display driving period at the driving timing shown in FIG. 2.

Referring to FIG. 3, a plurality of touch electrodes (TE) may be arranged in an active area (A/A) in which a plurality of subpixels (SP) are arranged in a touch display panel (110). In addition, a touch driving circuit (150) that supplies voltage, signals, etc. for display driving or touch driving to these touch electrodes (TE) may be arranged in a non-active area (N/A).

One or more of these touch driving circuits (150) may be arranged depending on the size of the touch display panel (110), and FIG. 3 shows an example in which two touch driving circuits (151, 152) are arranged.

The touch driving circuit (150) outputs a touch driving signal to the touch line (TL) during the touch driving period. In addition, the touch driving circuit (150) can output a common voltage (Vcom) to the touch line (TL) during the display driving period.

Accordingly, each touch electrode (TE) is applied with a common voltage (Vcom) during the display driving period, and can function as a common electrode (COM) during the display driving period.

At this time, since the common electrode (COM) is arranged in a divided structure for touch sensing, the common voltage (Vcom) applied to each common electrode (COM) may not be constant due to differences in the load of the touch line (TL) or the presence of a boundary portion of the common electrode (COM).

And, as the display is driven while this common voltage (Vcom) is applied, the quality of the image displayed through the touch display panel (110) may deteriorate.

Embodiments of the present invention provide a method for improving image quality during a display driving period in a touch display device (100) that uses a display driving electrode as a touch electrode (TE).

FIG. 4 is a drawing showing an example of a structure in which a feedback control circuit (400) is arranged in a touch display device (100) according to embodiments of the present invention.

Referring to FIG. 4, a touch display device (100) according to embodiments of the present invention may include a touch display panel (110) in which a plurality of touch electrodes (TE) and a plurality of touch lines (TL) are arranged, and a touch driving circuit (150) that drives the plurality of touch electrodes (TE).

Here, the touch driving circuit (150) may be placed, for example, in a non-active area (N/A) of the touch display panel (110), i.e., a bezel area, and one or more touch driving circuits (150) may be placed depending on the size of the touch display panel (110).

In some cases, this touch driving circuit (150) may be implemented integrally with the data driving circuit (130).

In addition, the touch display device (100) may include a compensation circuit (160) that receives a feedback common voltage (VcomFB) and outputs a compensation common voltage (VcomCP) based on the feedback common voltage (VcomFB).

This compensation circuit (160) may be arranged separately from the touch driving circuit (150), or, in some cases, may be implemented integrally with the touch driving circuit (150).

In this specification, the touch driving circuit (150) and the compensation circuit (160) may be collectively referred to as a “driving circuit.”

A feedback control circuit (400) may be placed in a non-active area (N/A) of the touch display panel (110).

The feedback control circuit (400) may include a feedback control transistor (401) electrically connected to a touch line (TL) arranged on a touch display panel (110), a feedback voltage line (402) electrically connected between the feedback control transistor (402) and a compensation circuit (160), and a feedback control signal line (403) electrically connected to a gate electrode of the feedback control transistor (401).

The feedback control transistor (401) can be electrically connected to a touch line (TL) that is electrically connected to each of a plurality of touch electrodes (TE).

For example, each of a plurality of touch lines (TL) is electrically connected to each of a plurality of touch electrodes (TE) arranged on the touch display panel (110). Here, in some cases, two or more touch lines (TL) may be electrically connected to one touch electrode (TE).

The touch line (TL) may include a first portion (TLa) electrically connected between the touch driving circuit (150) and the touch electrode (TE), and a second portion (TLb) electrically connected between the touch electrode (TE) and the feedback control transistor (401).

That is, the feedback control transistor (401) can be electrically connected to the second portion (TLb) of the touch line (TL) connected to the touch electrode (TE).

Therefore, the common voltage (Vcom) supplied to the touch electrode (TE) through the touch line (TL) during the display driving period can be fed back through the feedback control transistor (401).

The feedback voltage line (402) is electrically connected to the feedback control transistor (401) and may be placed in a non-active area (N/A) of the touch display panel (110). In addition, the feedback voltage line (402) may be electrically connected to the compensation circuit (160).

In some cases, two or more feedback voltage lines (402) may be arranged on the touch display panel (110).

The feedback control signal line (403) is electrically connected to the gate electrode of the feedback control transistor (401) and can control the operation of the feedback control transistor (401).

For example, during the touch driving period, a signal at a level that turns off the feedback control transistor (401) can be applied to the feedback control signal line (403).

Accordingly, the touch line (TL) and the feedback voltage line (402) connected to the touch electrode (TE) are electrically separated. Then, touch sensing can be performed while each touch electrode (TE) is electrically separated.

And, during the display driving period, a signal at a level that turns on the feedback control transistor (401) can be applied to the feedback control signal line (403).

As the feedback control transistor (401) is turned on, the touch line (TL) connected to the touch electrode (TE) and the feedback voltage line (402) become electrically connected. In addition, the touch electrode (TE) arranged on the touch display panel (110) may become electrically connected through the feedback voltage line (402).

That is, a plurality of touch electrodes (TE) that are divided and arranged for touch sensing can be electrically connected during the display driving period. Accordingly, the display can be driven stably compared to a case where a common voltage (Vcom) for display driving is applied in a state where the touch electrodes (TE) are divided.

Additionally, a feedback common voltage (VcomFB) can be input to the compensation circuit (160) through a feedback voltage line (402) electrically connected to the touch line (TL). Then, the compensation circuit (160) can output a compensation common voltage (VcomCP) based on the input feedback common voltage (VcomFB).

For example, the compensation circuit (160) may output a compensation common voltage (VcomCP) that is inverted based on the common voltage (Vcom) supplied to the touch electrode (TE) during the display driving period, based on the feedback common voltage (VcomFB). Alternatively, the compensation common voltage (VcomCP) that is inverted and amplified based on the common voltage (Vcom) may be output.

In addition, by supplying this compensation common voltage (VcomCP) to the touch electrode (TE), the voltage state of the touch electrode (TE) can be stabilized during the display driving period.

That is, embodiments of the present invention enable the voltage state of the touch electrodes (TE), i.e., the common electrode (COM), to be stabilized during the display driving period by ensuring that a plurality of touch electrodes (TE) are electrically connected during the display driving period.

In addition, by receiving feedback on the common voltage (Vcom) applied to the common electrode (COM) and supplying a compensation common voltage (VcomCP) based on the fed-back feedback common voltage (VcomFB), it is possible to prevent occurrence of image quality abnormalities due to fluctuations in the voltage applied to the common electrode (COM) during the display driving period.

FIG. 5 is a drawing showing an example of how the feedback control circuit (400) illustrated in FIG. 4 operates during a touch operation period.

Referring to FIG. 5, a feedback control circuit (400) may be placed in a non-active area (N/A) of a touch display panel (110). And, the feedback control circuit (400) may include a feedback control transistor (401), a feedback voltage line (402), and a feedback control signal line (403).

Here, as an example of a case where the feedback control transistor (401) is an N type, a low level feedback control signal (FCS) can be applied through the feedback control signal line (403) during the touch driving period.

Accordingly, the feedback control transistor (401) is turned off during the touch driving period, and the touch line (TL) and the feedback voltage line (402) are electrically separated. In addition, the touch electrode (TE) electrically connected to the touch line (TL) are electrically separated from each other.

And, during the touch driving period, a pulse-shaped touch driving signal (TDS) can be applied to the touch electrode (TE) through a plurality of touch lines (TL).

In this way, by supplying a touch driving signal (TDS) to the touch electrode (TE) while the feedback control transistor (401) is turned off during the touch driving period, touch sensing can be performed using the common electrode (COM) arranged on the display panel (110) as the touch electrode (TE).

FIG. 6 is a drawing showing an example of how the feedback control circuit (400) illustrated in FIG. 4 operates during the display driving period.

Referring to FIG. 6, a high level feedback control signal (FCS) can be applied to a feedback control signal line (403) included in a feedback control circuit (400) during a display driving period.

Therefore, the feedback control transistor (401) can be turned on during the display driving period.

And, as the feedback control transistor (401) is turned on, the touch line (TL) and the feedback voltage line (402) can be electrically connected. In addition, as the touch electrode (TE) electrically connected to the touch line (TL) is electrically connected to the feedback voltage line (402), a plurality of touch electrodes (TE) arranged on the touch display panel (110) can be electrically connected to each other.

Here, the touch driving circuit (150) can output a common voltage (Vcom) for driving the display to the touch electrode (TE) through the touch line (TL).

Accordingly, a common voltage (Vcom) can be supplied while a plurality of touch electrodes (TE) arranged on a touch display panel (110) are electrically connected, and the voltage state of the touch electrodes (TE) can be stabilized compared to a case where the common voltage (Vcom) is supplied while a plurality of touch electrodes (TE) are electrically separated.

And, a feedback voltage line (402) electrically connected to a feedback control transistor (401) can transmit a common voltage (Vcom) applied to a touch electrode (TE) through a touch line (TL) to a compensation circuit (160).

That is, the feedback common voltage (VcomFB) can be input to the compensation circuit (160) through the feedback voltage line (402).

The compensation circuit (160) can invert the feedback common voltage (VcomFB) input through the feedback voltage line (402) or output the inverted and amplified compensation common voltage (VcomCP) to the touch driving circuit (150). Then, the touch driving circuit (150) can output the compensation common voltage (VcomCP) input from the compensation circuit (160) to the touch electrode (TE) through the touch line (TL).

In this way, as the compensation common voltage (VcomCP) obtained by inverting or inverting-amplifying the feedback common voltage (VcomFB) by the compensation circuit (160) is applied to the touch electrode (TE), the display can be driven by compensating for the voltage fluctuation of the touch electrode (TE) that is physically separated and arranged in real time during the display driving period.

FIG. 7 is a diagram showing an example of a compensation common voltage (VcomCP) output by a compensation circuit (160) during the driving process illustrated in FIG. 6.

Referring to FIG. 7, the compensation circuit (160) can receive a feedback common voltage (VcomFB) through the feedback voltage line (402) during the display driving period.

Additionally, the compensation circuit (160) can output a compensation common voltage (VcomCP) that is an inverted amplified version of the feedback common voltage (VcomFB) received through the feedback voltage line (402) to the touch driving circuit (150).

Here, the compensation circuit (160) can invert the feedback common voltage (VcomFB) based on the level of the common voltage (Vcom) applied to the touch electrode (TE) during the display driving period. In addition, the inverted feedback common voltage (VcomFB) can be amplified and output.

That is, since the compensation common voltage (VcomCP) is a voltage for compensating for the shaking of the common voltage (Vcom) applied to the touch electrode (TE) during the display driving period, the compensation circuit (160) can output the compensation common voltage (VcomCP) by inverting and amplifying the feedback common voltage (VcomFB) based on the common voltage (Vcom).

In addition, by applying a compensation common voltage (VcomCP) to the touch electrode (TE) through the touch driving circuit (150), the voltage state of the touch electrode (TE) that functions as the display driving electrode during the display driving period is stabilized, thereby improving the image quality.

Meanwhile, the examples described above show a case where the feedback control circuit (400) includes one feedback voltage line (402) and the feedback control transistor (401) is arranged on the opposite side of the area where the touch driving circuit (150) is arranged, but the feedback control circuit (400) may be arranged in various forms depending on the arrangement structure of the touch driving circuit (150), the connection structure of the touch line (TL), etc.

FIG. 8 is a drawing showing another example of a structure in which a feedback control circuit (400) is arranged in a touch display device (100) according to embodiments of the present invention.

Referring to FIG. 8, a plurality of touch electrodes (TE) may be arranged in an active area (A/A) of a touch display panel (110). In addition, a plurality of touch lines (TL) electrically connected to the touch electrodes (TE) and a touch driving circuit (150) that outputs voltage, signals, etc. through the touch lines (TL) may be arranged.

In addition, a feedback control circuit (400) for feeding back a common voltage (Vcom) supplied to a touch electrode (TE) and a compensation circuit (160) for outputting a compensation common voltage (VcomCP) that is an inverted amplified version of a feedback common voltage (VcomFB) received from the feedback control circuit (400) may be arranged in the touch display panel (110).

In some cases, the compensation circuit (160) or the like may be mounted on a printed circuit board located outside the touch display panel (110) and electrically connected to the touch display panel (110).

The feedback control circuit (400) may include a feedback control transistor (401) electrically connected to a touch line (TL), a feedback voltage line (402) electrically connected between the feedback control transistor (401) and a compensation circuit (160), and a feedback control signal line (403) electrically connected to a gate electrode of the feedback control transistor (401).

Here, the feedback control circuit (400) may be placed in an area where the touch driving circuit (150) is placed in the touch display panel (110). That is, the feedback control circuit (400) may be placed in a pad area among the non-active areas (N/A) of the touch display panel (110).

As the feedback control circuit (400) is placed in the pad area, the touch line (TL) electrically connected to the touch electrode (TE) can be electrically connected to the feedback control transistor (401) in the pad area.

For example, each of the plurality of touch lines (TL) may include a first portion (TLa) connecting between the touch driving circuit (150) and the touch electrode (TE), and a second portion (TLb) connecting between the touch electrode (TE) and the feedback control transistor (401).

And, the second part (TLb) of the touch line (TL) can be arranged in a structure extending from the first part (TLa) of the touch line (TL) and returning to the pad area. At this time, the second part (TLb) of the touch line (TL) can overlap the touch electrode (TE) to which the first part (TLa) of the touch line (TL) is connected.

By the structure in which the second part (TLb) of the touch line (TL) returns to the pad area, the touch line (TL) and the feedback control transistor (400) of the feedback control circuit (400) can be electrically connected.

In this way, by allowing the feedback control circuit (400) to be placed in the bezel area where the touch driving circuit (150) is placed, the feedback control circuit (400) can be placed without increasing the upper bezel area of the touch display panel (110).

FIG. 9 is a drawing showing another example of a structure in which a feedback control circuit (400) is arranged in a touch display device (100) according to embodiments of the present invention.

Referring to FIG. 9, a plurality of touch electrodes (TE), a plurality of touch lines (TL), and one or more touch driving circuits (150) may be arranged on a touch display panel (110). In addition, a feedback control circuit (400) and a compensation circuit (160) may be arranged.

The feedback control circuit (400) includes a feedback control transistor (401), a feedback voltage line (402), and a feedback control signal line (403), and can be placed in a non-active area (N/A) where a touch driving circuit (150) is placed in the touch display panel (110).

Here, the touch line (TL) may include a first portion (TLa) electrically connecting between the touch electrode (TE) and the touch driving circuit (150), and a second portion (TLb) electrically connecting between the touch electrode (TE) and the feedback control transistor (401).

Additionally, the first portion (TLa) and the second portion (TLb) of the touch line (TL) may be physically separated structures.

That is, the first portion (TLa) and the second portion (TLb) of the touch line (TL) can be electrically connected to the touch electrode (TE), respectively. In addition, the second portion (TLb) electrically connected to the touch electrode (TE) can be electrically connected to the feedback control transistor (401) of the feedback control circuit (400).

Accordingly, in a structure in which the feedback control circuit (400) is placed in the pad area, the feedback control circuit (400) and the touch electrode (TE) can be electrically connected without a structure in which the first portion (TLa) of the touch line (TL) extends and returns.

In addition, through the above-described structure, it is possible to facilitate the placement of the feedback control circuit (400) when the touch driving circuit (150) is placed on both sides of the touch display panel (110).

FIG. 10 is a drawing showing another example of a structure in which a feedback control circuit (400) is arranged in a touch display device (100) according to embodiments of the present invention.

Referring to FIG. 10, a plurality of touch electrodes (TE), a plurality of touch lines (TL), and one or more touch driving circuits (150) may be arranged on a touch display panel (110).

Here, depending on the type of the touch display panel (110), a plurality of touch driving circuits (150) may be arranged on both sides of the touch display panel (110).

That is, as in the example illustrated in FIG. 10, a first touch driving circuit (151) and a second touch driving circuit (152) may be placed in the lower non-active area (N/A) of the touch display panel (110), and a third touch driving circuit (153) and a fourth touch driving circuit (154) may be placed in the upper non-active area (N/A) of the touch display panel (110).

In addition, the first touch driving circuit (151) and the second touch driving circuit (152) can drive a touch electrode (TE) arranged in a lower area of the touch display panel (110), and the third touch driving circuit (153) and the fourth touch driving circuit (154) can drive a touch electrode (TE) arranged in an upper area of the touch display panel (110).

Additionally, a plurality of feedback control circuits (400) may be arranged on the touch display panel (110), and each feedback control circuit (400) may be arranged separately according to the driving area of the touch electrode (TE).

For example, the first feedback control circuit (410) may be disposed in a non-active area (N/A) where the first touch driving circuit (151) and the second touch driving circuit (152) are disposed. The first feedback control circuit (410) may include a first feedback control transistor (411), a first feedback voltage line (412), and a first feedback control signal line (413), and may be electrically connected to the first compensation circuit (161).

And, the second feedback control circuit (420) may be placed in a non-active area (N/A) where the third touch driving circuit (153) and the fourth touch driving circuit (154) are placed. The second feedback control circuit (420) may include a second feedback control transistor (421), a second feedback voltage line (422), and a second feedback control signal line (423), and may be electrically connected to the second compensation circuit (162).

The first feedback control transistor (411) included in the first feedback control circuit (410) can be electrically connected to a touch line (TL) that is electrically connected to a touch electrode (TE) driven by the first touch driving circuit (151) or the second touch driving circuit (152).

Here, the touch line (TL) may include a first portion (TLa) connecting between the touch driving circuit (151, 152) and the touch electrode (TE), and a second portion (TLb) connecting between the touch electrode (TE) and the first feedback control transistor (411).

Additionally, the first portion (TLa) and the second portion (TLb) of the touch line (TL) may be physically separated structures.

Additionally, the second feedback control transistor (412) included in the second feedback control circuit (420) may be electrically connected to a touch line (TL) that is electrically connected to a touch electrode (TE) driven by the third touch driving circuit (153) or the fourth touch driving circuit (154).

That is, the first feedback control circuit (410) can receive a feedback common voltage (VcomFB) from a touch electrode (TE) placed in a lower area of the touch display panel (110), and the second feedback control circuit (420) can receive a feedback common voltage (VcomFB) from a touch electrode (TE) placed in an upper area of the touch display panel (110).

And, each of the first compensation circuit (161) and the second compensation circuit (162) can output a compensation common voltage (VcomCP) that is an inverted amplified version of the feedback common voltage (VcomFB) received through the first feedback control circuit (410) and the second feedback control circuit (420).

Accordingly, real-time compensation for the common voltage (Vcom) applied to the touch electrode (TE) during the display driving period can be achieved by using the first feedback control circuit (410) and the second feedback control circuit (420) which are electrically separated from each other and arranged on the upper and lower sides of the touch display panel (110).

In addition, by connecting the touch driving circuit (150) and the touch electrode (TE) by the first part (TLa) of the touch line (TL), and connecting the feedback control circuit (400) and the touch electrode (TE) by the second part (TLb) physically separated from the first part (TLa), a bypass structure of the touch line (TL) can be prevented from being arranged in a boundary area between the touch electrode (TE) arranged on the upper side and the touch electrode (TE) arranged on the lower side.

According to the embodiments of the present invention described above, by controlling a feedback control transistor (401) connecting a touch line (TL) connected to a touch electrode (TE) and a feedback voltage line (402), it is possible to easily control whether a plurality of touch electrodes (TE) arranged on a touch display panel (110) are electrically connected during a touch driving period and a display driving period.

Therefore, by ensuring that a plurality of touch electrodes (TE) are electrically connected during the display driving period, the common voltage (Vcom) supplied to the plurality of touch electrodes (TE) can be stabilized.

In addition, the compensation circuit (160) supplies a compensation common voltage (VcomCP) that is output by inverting and amplifying the feedback common voltage (VcomFB) received through the feedback voltage line (402) to the touch electrode (TE), thereby enabling real-time compensation for the shaking of the common voltage (Vcom) applied to the touch electrode (TE) during the display driving period.

Through this, the image quality can be improved when driving the display of a touch display device (100) that performs touch sensing by using the display driving electrode as a touch electrode (TE).

The above description is merely an illustrative description of the technical idea of the present invention, and those skilled in the art will appreciate that various modifications and variations may be made without departing from the essential characteristics of the present invention. In addition, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention but to explain it, and therefore the scope of the technical idea of the present invention is not limited by these embodiments. The protection scope of the present invention should be interpreted by the following claims, and all technical ideas within a scope equivalent thereto should be interpreted as being included in the scope of the rights of the present invention.

100: Touch display device 110: Touch display panel
120: Gate driving circuit 130: Data driving circuit
140: Controller 150: Touch driving circuit
160: Compensation circuit 400: Feedback control circuit
401: Feedback control transistor 402: Feedback voltage line
403: Feedback control signal line

Claims (18)

A plurality of touch electrodes built into the panel and arranged separately from each other;
A plurality of touch lines electrically connected to each of the plurality of touch electrodes;
A plurality of feedback control transistors electrically connected to each of the plurality of touch lines;
At least one feedback voltage line electrically connected to said plurality of feedback control transistors; and
During the display driving period, at least one driving circuit outputs a display driving voltage to the plurality of touch lines, and outputs the display driving voltage compensated according to a signal received through the at least one feedback voltage line to the plurality of touch lines.
Including,
The above multiple feedback control transistors,
In the above panel, at least one driving circuit is arranged in a first bezel area,
Each of the above multiple touch lines,
A first part electrically connecting the driving circuit and the touch electrode; and
A second portion extending from the first portion and electrically connecting the touch electrode and the feedback control transistor, at least a portion of which overlaps the touch electrode connected to the first portion,
Each of the above multiple touch lines,
The first part is electrically connected from the driving circuit of the first bezel area to at least one of the touch electrodes and is disposed through the panel to a second bezel area, which is a bezel area opposite the first bezel area.
The second portion is arranged to be connected from the second bezel area through the panel to the feedback control transistor of the first bezel area,
A touch display device in which the first part and the second part are connected to each other in the second bezel area and return to the first bezel area.
delete In the first paragraph,
The above multiple feedback control transistors,
A touch display device that is turned on during the display driving period and turned off during a touch driving period that is temporally distinct from the display driving period.
In the first paragraph,
At least one of the above driving circuits,
A touch display device that inverts and amplifies a voltage received through at least one feedback voltage line during the display driving period based on the display driving voltage and outputs the same to the plurality of touch lines.
delete delete delete delete delete In the first paragraph,
A touch display device further comprising a feedback control signal line electrically connected to the gate electrodes of the plurality of feedback control transistors.
In a touch display panel, a plurality of touch electrodes arranged separately from each other;
A plurality of touch lines electrically connected to each of the plurality of touch electrodes;
A plurality of feedback control transistors electrically connected to each of the plurality of touch lines;
At least one feedback voltage line electrically connected to said plurality of feedback control transistors; and
During the display driving period, the display driving voltage is output to the plurality of touch lines, and at least one driving circuit is included that outputs the display driving voltage compensated according to a signal received through the at least one feedback voltage line to the plurality of touch lines.
The above multiple feedback control transistors,
In the above touch display panel, at least one driving circuit is disposed in a first bezel area,
Each of the above multiple touch lines,
A first part electrically connecting the driving circuit and the touch electrode; and
A second portion extending from the first portion and electrically connecting the touch electrode and the feedback control transistor, at least a portion of which overlaps the touch electrode connected to the first portion,
Each of the above multiple touch lines,
The first part is electrically connected from the driving circuit of the first bezel area to at least one of the touch electrodes and is disposed through the touch display panel to a second bezel area, which is a bezel area opposite the first bezel area.
The second portion is arranged to be connected from the second bezel area through the touch display panel to the feedback control transistor of the first bezel area,
A touch display panel having a structure in which the first portion and the second portion are connected to each other in the second bezel area and return to the first bezel area.
delete In Article 11,
The above multiple feedback control transistors,
A touch display panel that is turned on during the display driving period and turned off during a touch driving period that is temporally distinct from the display driving period.
In Article 11,
At least one of the above driving circuits,
A touch display panel that inverts and amplifies a voltage received through at least one feedback voltage line during the display driving period based on the display driving voltage and outputs the same to the plurality of touch lines.
In Article 11,
A touch display panel further comprising a feedback control signal line electrically connected to the gate electrodes of the plurality of feedback control transistors.
At least one feedback voltage line arranged in the bezel area of the panel;
a plurality of feedback control transistors electrically connected between at least one of the feedback voltage lines and each of the plurality of touch lines arranged on the panel; and
A feedback control signal line electrically connected to the gate electrodes of the plurality of feedback control transistors,
The above multiple feedback control transistors,
A display driving circuit is turned on during a display driving period and turned off during a touch driving period, and is disposed in a first bezel area on the panel where at least one driving circuit is disposed.
Each of the above multiple touch lines,
A first part electrically connecting the driving circuit and the touch electrode on the panel; and
A second portion extending from the first portion and electrically connecting the touch electrode and the feedback control transistor, at least a portion of which overlaps the touch electrode connected to the first portion,
Each of the above multiple touch lines,
The first part is electrically connected from the driving circuit of the first bezel area to at least one of the touch electrodes and is disposed through the panel to a second bezel area, which is a bezel area opposite the first bezel area.
The second portion is arranged to be connected from the second bezel area through the panel to the feedback control transistor of the first bezel area,
A feedback control circuit in which the first part and the second part are connected to each other in the second bezel area and are structured to return to the first bezel area.
In Article 16,
Each of the above multiple touch lines,
Each of a plurality of touch electrodes arranged separately from each other on the above panel is electrically connected to each other,
A feedback control circuit electrically connected to the touch electrode between a point where the touch line is connected to a driving circuit that applies a signal to the touch line and a point where the touch line is connected to the feedback control transistor.
In Article 17,
The above multiple touch lines,
During the above touch driving period, a touch driving signal is applied,
A feedback control circuit that receives a voltage that the driving circuit inverts and amplifies to output a voltage received through the feedback voltage line during the display driving period.

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