KR102481862B1 - Touch power driving circuit and display apparatus with integrated touch screen comprising the same - Google Patents

Abstract

The present invention provides a touch power driving circuit capable of supplying a gate row modulation voltage and a gate voltage for panel discharge to a gate driving circuit through one signal supply line, and a touch screen integrated display device including the same. The touch power driving circuit according to the present invention includes a gate voltage modulator generating a voltage selectively supplied to a gate line provided in a display panel, and the gate voltage modulator generates a normal gate low voltage based on a low voltage lock signal, a touch synchronization signal, and a touch pulse control signal. Any one of the voltage, the gate voltage for panel discharge, the first gate row modulation voltage, and the second gate row modulation voltage may be output to an output terminal.

Description

Touch power driving circuit and touch screen integrated display device including the same

The present invention relates to a touch power driving circuit and a touch screen integrated display device including the same.

A touch screen is installed in an image display device such as a liquid crystal display device, a field emission display device, a plasma display device, an electroluminescence display device, an electrophoretic display device, and an organic light emitting display device, so that a user can use a finger or a pen while viewing the display device. It is a type of input device that inputs information by directly contacting the screen. Such touch panels are used in electronic notebooks, electronic books, portable multimedia players (PMPs), navigation systems, ultra mobile PCs (UMPCs), mobile phones, smart phones, smart watches, tablet PCs (personal computers), It is used as an input device for various products such as televisions, laptops, and monitors as well as portable electronic devices such as watch phones and mobile communication terminals.

Recently, demand for an in-cell touch-type display device in which elements constituting a touch panel are embedded inside a display panel of a display device is increasing in order to slim down a portable electronic device.

1 is a waveform diagram illustrating signals applied to a conventional in-cell touch type display device having a self-capacitance method.

Referring to FIG. 1 , a conventional in-cell touch type display device time-divides one frame into an image display period (DP) and a touch sensing mode (TM) according to a touch synchronization signal (Tsync) and drives.

A conventional in-cell touch type display device sequentially supplies gate signals GS to gate lines GL1 to GLm during an image display period DP, and transmits a data signal synchronized with the gate signal GS to the data lines. A predetermined image is displayed by supplying the common voltage Vcom to the touch electrodes TE used as common electrodes as well as to (DL1 to DLn).

In addition, a conventional in-cell touch type display device supplies a touch electrode driving signal TDS to touch electrodes TE through a touch routing line during a touch sensing mode TM and detects a user touch through a touch routing line. do. At this time, the data load free signal LFS1 is supplied to the data lines DL in synchronization with the touch electrode driving signal TDS supplied to the touch electrodes TE during the touch sensing mode TM, and the gate lines ( A gate load free signal LFS2 (or gate low modulation voltage) is supplied to GL1 to GLm. Here, each of the data load free signal LFS1 and the gate load free signal LFS2 is synchronized with the touch electrode driving signal TDS supplied to the touch electrodes TE.

Such a conventional in-cell touch type display device supplies load free signals LFS1 and LFS2 to gate lines GL1 to GLm and data lines DL1 to DLn, respectively, during the touch sensing mode TM, Through this, the load of the touch electrodes TE due to parasitic capacitance generated between the gate lines GL1 to GLm and the data lines DL1 to DLn and the touch electrodes TE is reduced, thereby improving touch sensitivity. can improve

Such a conventional in-cell touch-type display device has a problem in that afterimages remain due to charges charged in the storage capacitor of each sub-pixel when the power is turned off. In order to solve this afterimage problem, when the power is turned off, a gate voltage for panel discharge is separately generated and supplied to the gate lines GL1 to GLm through a gate driving circuit to quickly discharge the charge charged in the storage capacitor of each subpixel. Panel discharge technology is applied. However, a conventional in-cell touch type display device to which panel discharge technology is applied has a problem in that separate signal supply lines are required to supply a gate load free signal and a gate voltage for panel discharge to a gate driving circuit.

The contents of the panel discharge technology applied to the above-described conventional in-cell touch type display device are technical information that the inventor of the present application possessed for derivation of the present invention or acquired in the process of derivation of the present invention. It cannot be said that it is a known technology disclosed to the general public before filing.

The present invention has been made to solve the above problems, a touch power driving circuit capable of supplying a gate row modulation voltage and a gate voltage for panel discharge to a gate driving circuit through one signal supply line, and a touch screen integrated type including the same It is a technical challenge to provide a display device.

A touch power driving circuit according to the present invention for achieving the above technical problem includes a gate voltage modulator for generating a voltage selectively supplied to a gate line provided in a display panel, and the gate voltage modulator includes a low voltage lock signal and a touch sync signal. and outputting one of a normal gate low voltage, a gate voltage for panel discharge, a first gate low modulation voltage, and a second gate low modulation voltage to an output terminal based on the touch pulse control signal.

A touch screen integrated display device according to the present invention for achieving the above technical problem is a display panel having a gate line, a data line, and a touch electrode, a built-in gate driving circuit connected to the gate line, a low voltage lock signal, a touch sync signal, and a touch pulse Touch driving that selects one of the normal gate low voltage, the gate voltage for panel discharge, the first gate low modulation voltage, and the second gate low modulation voltage according to the driving mode of the display panel according to the control signal and supplies it to the built-in gate driving circuit It may include a signal supply unit.

According to the present invention, the number of channels of each of the touch power driving circuit and the embedded gate driving circuit can be reduced.

Also, according to the present invention, the chip size of the touch power driving circuit can be reduced.

In addition to the effects of the present invention mentioned above, other features and advantages of the present invention will be described below, or will be clearly understood by those skilled in the art from such description and description.

1 is a waveform diagram illustrating signals applied to a conventional in-cell touch type display device having a self-capacitance method.
2 is a diagram for explaining a touch power driving circuit according to an example of the present invention.
3 is a driving waveform diagram of a touch power driving circuit according to an example of the present invention.
FIG. 4 is a diagram illustrating an operating state of a touch power driving circuit in the display mode shown in FIG. 3 .
FIG. 5 is a diagram illustrating an operating state of a touch power driving circuit in the touch sensing mode shown in FIG. 3 .
FIG. 6 is a diagram illustrating an operating state of a touch power driving circuit in the panel discharge mode shown in FIG. 3 .
7 is a diagram for explaining an additional configuration of a touch power driving circuit according to an example of the present invention.
8 is a driving waveform diagram of the touch power driving circuit shown in FIG. 7 .
9 is a diagram for explaining a display device integrated with a touch screen according to an example of the present invention.
FIG. 10 is a waveform diagram illustrating signals applied to the display panel shown in FIG. 9 .
FIG. 11 is a diagram for explaining the touch driver shown in FIG. 9 .
FIG. 12 is a diagram for explaining the data driving circuit shown in FIG. 9 .
FIG. 13 is a diagram for explaining the built-in gate driving circuit shown in FIG. 9 .

The meaning of terms described in this specification should be understood as follows.

Singular expressions should be understood to include plural expressions unless the context clearly defines otherwise, and terms such as “first” and “second” are used to distinguish one component from another, The scope of rights should not be limited by these terms. It should be understood that terms such as "comprise" or "having" do not preclude the presence or addition of one or more other features, numbers, steps, operations, components, parts, or combinations thereof. The term “at least one” should be understood to include all possible combinations from one or more related items. For example, "at least one of the first item, the second item, and the third item" means not only the first item, the second item, or the third item, respectively, but also two of the first item, the second item, and the third item. It means a combination of all items that can be presented from one or more. The term "on" means not only the case where a certain component is formed directly on top of another component, but also the case where a third component is interposed between these components.

Hereinafter, a touch power driving circuit according to the present invention and a preferred example of a touch screen integrated display device including the same will be described in detail with reference to the accompanying drawings. In adding reference numerals to components of each drawing, the same components may have the same numerals as much as possible even if they are displayed on different drawings. In addition, in describing the present invention, if it is determined that a detailed description of a related known configuration or function may obscure the gist of the present invention, the detailed description may be omitted.

2 is a diagram for explaining a touch power driving circuit according to an example of the present invention.

Referring to FIG. 2 , a touch power driving circuit according to an example of the present invention modulates a voltage selectively supplied to a gate line provided in a display panel according to a driving mode of a display panel (not shown). For example, a display panel includes an in-cell touch type touch electrode and a built-in gate driving circuit connected to a gate line, and may be driven in driving modes, that is, a display mode, a touch sensing mode, and a panel discharge mode. Accordingly, the touch power driving circuit includes a normal gate low voltage (VGL_N) in the display mode, a first gate low modulation voltage (VGL_H) and a second gate low modulation voltage (VGL_L) that alternate with each other in the touch sensing mode, and In the panel discharge mode, the gate voltage Vp_dis for panel discharge may be output to the built-in gate driving circuit. Here, the first gate row modulation voltage VGL_H and the second gate row modulation voltage VGL_L are gate load free signals for preventing a decrease in sensing sensitivity due to parasitic capacitance between the touch electrode and the gate line in the touch sensing mode. can be defined as Therefore, the touch power driving circuit according to an example of the present invention supplies the gate row modulation voltages (VGL_N, VGL_H, VGL_L) and the gate voltage (Vp_dis) for panel discharge to the built-in gate driving circuit through one signal supply line, respectively. The number of channels can be reduced, and the number of channels in the built-in gate driving circuit can be reduced.

A touch power driving circuit according to an example includes a gate voltage modulator 110 .

The gate voltage modulator 110 according to an example includes a first voltage output unit 111, a first gate low voltage generator 113, a second gate low voltage generator 115, and a second voltage output unit ( 117).

The first voltage output unit 111 selectively sets the normal gate low voltage (VGL_N) or the panel discharge gate voltage (Vp_dis) based on an under voltage lock out signal (UVLO) and a touch synchronization signal (Tsync). output as For example, the first voltage output unit 111 selects and outputs the normal gate low voltage (VGL_N) to the second voltage output unit 117 during the display mode, and outputs the gate voltage for panel discharge during the panel discharge mode ( Vp_dis) can be selected and output. Here, the low voltage lock signal UVLO is provided from an external low voltage detection circuit (not shown), and when the voltage level of the input power is equal to or higher than the reference voltage level, the low voltage lock signal UVLO in the first logic state ) is generated, and when the voltage level of the input power is less than the reference voltage level, a low voltage locking signal UVLO in a second logic state inverted from the first logic state is generated. Also, the touch synchronization signal Tsync may be provided from a host controller (not shown) of the display device. The host controller generates a touch synchronization signal Tsync for dividing and driving the frame period of the display panel into a display mode and a touch sensing mode. Here, the host controller time-divides each frame of the display panel into at least one subframe based on the frame synchronization signal (or vertical synchronization signal), and the touch synchronization signal for driving each subframe in a display mode and a touch sensing mode ( Tsync) can be created. In addition, the host controller generates a touch pulse control signal (PCS) for generating a touch electrode driving signal supplied to the touch electrodes in a touch sensing mode.

The first voltage output unit 111 according to an example includes a first switch driver 111a, a first switching element SW1, and a second switching element SW2.

The first switch driver 111a controls on/off of each of the first switching element SW1 and the second switching element SW2 based on the low voltage lock signal UVLO and the touch synchronization signal Tsync. That is, the first switch driver 111a generates different first switching control signals SS1 and second switching control signals SS2 based on the low voltage lock signal UVLO and the touch synchronization signal Tsync. For example, the first switch driver 111a controls the first switching in the first logic state during the display mode according to the low voltage lock signal UVLO in the first logic state and the touch synchronization signal Tsync in the first logic state. The signal SS1 and the second switching control signal SS2 in the second logic state are generated. Also, the first switch driver 111a performs a first switching control signal SS1 in a second logic state and a second switching control signal SS1 in a first logic state during the panel discharge mode according to the low voltage lock signal UVLO in a second logic state. A control signal SS2 is generated.

The first switch driver 111a according to an example performs a logic operation on the low voltage lock signal UVLO and the touch sync signal Tsync using a logic circuit (not shown) to control the first switching corresponding to the driving mode of the display panel. A signal SS1 and a second switching control signal SS2 may be generated.

The first switching element SW1 is connected between the first node N1 and the normal gate low voltage terminal and is switched according to the first switching control signal SS1 provided from the first switch driver 111a. That is, the first switching element SW1 is turned on according to the first switching control signal SS1 in the first logic state to generate the normal gate low voltage VGL_N through the first node N1 to the second voltage output unit. It is output to the output terminal (No) of (117). The first switching element SW1 is turned on only during the display mode to output the normal gate low voltage VGL_N, and remains turned off during the touch sensing mode and the panel discharge mode. The first switching element SW1 according to an example may be a field effect transistor.

The normal gate low voltage (VGL_L) is a signal for turning off the thin film transistor of each subpixel connected to the gate line of the display panel. can be defined as supplied. The normal gate low voltage VGL_L may be generated by an external power management circuit (not shown) and supplied to the first switching element SW1.

The second switching element SW2 is connected between the first node N1 and the gate voltage terminal for panel discharge and is switched according to the second switching control signal SS2 provided from the first switch driver 111a. That is, the second switching element SW2 is turned on according to the second switching control signal SS2 in the first logic state and outputs the gate voltage Vp_dis for panel discharge through the first node N1. It is output to the output terminal (No) of the unit 117. The second switching element SW2 is turned on only during the panel discharge mode to output the gate voltage Vp_dis for panel discharge, and is maintained in a turned-off state during the display mode and the touch sensing mode. The second switching element SW2 according to an example may be a field effect transistor.

The panel discharge gate voltage (Vp_dis) is a signal for discharging the charge charged in the storage capacitor of each sub-pixel of the display panel, and is supplied to the gate line in the panel discharge mode to turn on the thin film transistor of each sub-pixel. It can be defined as the voltage for The gate voltage Vp_dis for panel discharge may be generated by an external power management circuit (not shown) and supplied to the second switching element SW2. For example, the gate voltage Vp_dis for panel discharge may have the same voltage level as the gate high voltage supplied to the gate line during the scan period of each subpixel in the display mode.

Each of the first and second switching elements SW1 and SW2 is formed of a plurality of first field effect transistors connected in parallel to be simultaneously switched according to a switching control signal in order to minimize distortion of output voltage due to on-resistance, thereby providing low may have an on resistance. For example, each of the first and second switching devices SW1 and SW2 may include dozens of first field effect transistors connected in parallel.

The first gate row voltage generator 113 generates a first gate row modulation voltage VGL_H having a preset voltage level. Here, the first gate row modulation voltage VGL_H may have a higher voltage level than the normal gate low voltage VGL_N. For example, the first gate row modulation voltage VGL_H may have a voltage level between the voltage at which the thin film transistor connected to the gate line is not turned on and the normal gate low voltage VGL_N. Additionally, when the touch electrode driving signal supplied to the touch electrode has a voltage swing width that swings between the first voltage and the second voltage based on the common voltage, the first gate row modulation voltage VGL_H is the normal gate low voltage ( VGL_N) may have a higher voltage level by a voltage difference between the common voltage and the first voltage.

The first gate low voltage generator 113 according to an embodiment includes a non-volatile memory device (not shown) storing first digital voltage data corresponding to the first gate row modulation voltage VGL_H, first digital voltage data A first digital-to-analog converter (not shown) generating a first reference voltage using , and a first operational amplifier (or buffer) generating a first gate low modulation voltage VGL_H using the first reference voltage ( not shown) may be included.

The second gate low voltage generator 115 generates a second gate low modulation voltage VGL_L having a preset voltage level. Here, the second gate row modulation voltage VGL_L may have a lower voltage level than the normal gate low voltage VGL_N. For example, when the touch electrode driving signal supplied to the touch electrode has a voltage swing width that swings between the first voltage and the second voltage based on the common voltage, the second gate low modulation voltage VGL_L is a normal gate low It may have a voltage level lower than the voltage VGL_N by a voltage difference between the common voltage and the second voltage. Accordingly, a voltage width between the first gate row modulation voltage VGL_H and the second gate row modulation voltage VGL_L becomes equal to the voltage swing width of the touch electrode driving signal.

The second gate low voltage generator 115 according to an example generates a second reference voltage using second digital voltage data corresponding to the second gate low modulation voltage VGL_L stored in the non-volatile memory device. and a second operational amplifier (or buffer) (not shown) generating a second gate low modulation voltage VGL_L using a second digital-to-analog converter (not shown) and a second reference voltage.

The second voltage output unit 117 generates voltages VGL_N and Vp_dis output from the first voltage output unit 111 based on the low voltage lock signal UVLO, the touch synchronization signal Tsync, and the touch pulse control signal PCS. ) and one of the first gate row modulation voltage VGL_H and the second gate row modulation voltage VGL_L is output to the output terminal No, that is, the built-in gate driving circuit. For example, the second voltage output unit 117 outputs the normal gate low voltage VGL_N output from the first voltage output unit 111 through the output terminal No during the display mode, and the touch sensing mode The first gate row modulation voltage VGL_H supplied from the first gate low voltage generator 113 and the second gate row modulation voltage VGL_L supplied from the second gate low voltage generator 115 are connected to an output terminal ( No), and the panel discharge gate voltage Vp_dis output from the panel discharge driving mode first voltage output unit 111 is output through the output terminal No.

The second voltage output unit 117 according to an example includes a second switch driver 117a, a third switching element SW3, and a fourth switching element SW4.

The second switch driver 117a operates the third switching element SW3 and the fourth switching element SW4 based on the low voltage lock signal UVLO, the touch synchronization signal Tsync, and the touch pulse control signal PCS. control on/off. That is, the second switch driver 117a generates different third switching control signals SS3 and fourth switching control signals based on the low voltage lock signal UVLO, the touch synchronization signal Tsync, and the touch pulse control signal PCS. Generates signal SS4. For example, the second switch driver 117a may be connected to the third switching element SW3 during the display mode according to the low voltage lock signal UVLO in the first logic state and the touch synchronization signal Tsync in the first logic state. A third switching control signal SS3 in a second logic state and a fourth switching control signal SS4 in a second logic state for turning off all four switching elements SW4 are generated. In addition, the second switch driver 117a is based on the touch pulse control signal (PCS) during the touch sensing mode according to the undervoltage lock signal (UVLO) in a first logic state and the touch synchronization signal (Tsync) in a second logic state. The third switching control signal SS3 in the first logic state and the fourth switching control signal SS4 in the first logic state for alternately switching the third switching element SW3 and the fourth switching element SW4 with generate Further, the second switch driver 117a is configured to turn off both the third and fourth switching elements SW3 and SW4 during the panel discharge mode according to the low voltage locking signal UVLO in the second logic state. A third switching control signal SS3 in a logic state and a fourth switching control signal SS4 in a second logic state are generated.

The second switch driver 117a according to an example performs a logical operation on the low voltage lock signal UVLO, the touch synchronization signal Tsync, and the touch pulse control signal PCS using a logic circuit (not shown) to drive the display panel. A third switching control signal SS3 and a fourth switching control signal SS4 corresponding to the mode may be generated.

The third switching element SW3 is connected between the output terminal No and the first gate low voltage generator 113 and switches according to the third switching control signal SS3 provided from the second switch driver 117a. do. That is, the third switching element SW3 is turned on according to the third switching control signal SS3 in the first logic state and generates the first gate low modulation voltage VGL_H supplied from the first gate low voltage generator 113. ) to the output terminal (No). The third switching element SW3 is turned on only during the touch sensing mode to output the first gate low modulation voltage VGL_H, and remains turned off during the display mode and the panel discharge mode. The third switching element SW3 according to an example may be a field effect transistor.

The fourth switching element SW4 is connected between the output terminal No and the second gate low voltage generator 115 and switches according to the fourth switching control signal SS4 provided from the second switch driver 117a. do. That is, the fourth switching element SW4 is turned on according to the fourth switching control signal SS4 in the first logic state and generates the second gate low modulation voltage VGL_L supplied from the second gate low voltage generator 115. ) to the output terminal (No). The fourth switching element SW4 is turned on alternately with the third switching element SW3 only during the touch sensing mode to output the second gate low modulation voltage VGL_L, and during the display mode and panel discharge mode It remains turned off. The fourth switching element SW4 according to an example may be a field effect transistor.

Each of the third and fourth switching elements SW3 and SW4 is formed of a plurality of second field effect transistors connected in parallel so as to be simultaneously switched according to a switching control signal in order to minimize distortion of output voltage due to on-resistance, thereby providing low may have an on resistance. For example, each of the third and fourth switching elements SW3 and SW4 is composed of dozens of second field effect transistors connected in parallel, and the electric field is greater than that of each of the first and second switching elements SW1 and SW2. It can consist of effect transistors.

3 is a driving waveform diagram of a touch power driving circuit according to an example of the present invention, FIG. 4 is a view showing an operating state of the touch power driving circuit in the display mode shown in FIG. 3 , and FIG. FIG. 6 is a diagram showing an operating state of the touch power driving circuit in the panel discharge mode shown in FIG. 3 .

Referring to FIGS. 3 to 6 , an operation of the touch power driving circuit according to an example of the present invention will be described.

First, in the touch power driving circuit according to an example of the present invention, the low voltage locking signal UVLO, the touch sync signal Tsync, and the touch pulse control signal ( PCS) to operate in display mode (DM) and touch sensing mode (TM), and panel discharge mode (PM) in response to low voltage locking signal (UVLO) of second logic state (L) when power is off ) works.

3 and 4 , the touch power driving circuit according to an example of the present invention operates in the display mode (DM) according to the touch synchronization signal (Tsync) and generates a normal gate low voltage (VGL_N) through an output terminal (No). ) is output.

Specifically, in the display mode (DM), the first switch driver 111a of the first voltage output unit 111 generates a response between the low voltage lock signal UVLO of the first logic state H and the first switch driver 111a of the first logic state H. A first switching control signal SS1 in a first logic state and a second switching control signal SS2 in a second logic state are generated based on the touch synchronization signal Tsync. Accordingly, in the first voltage output unit 117, the first switching element SW1 is turned on by the first switching control signal SS1 in the first logic state, and the second switching element SW2 is turned on. It is maintained in the off state by the second switching control signal SS2 of the 2 logic state. At the same time, the second switch driver 117a of the second voltage output unit 117 generates the low voltage lock signal UVLO of the first logic state H and the touch synchronization signal Tsync of the first logic state H and The third and fourth switching control signals SS3 and SS4 of the second logic state are generated based on the touch pulse control signal PCS. Accordingly, in the second voltage output unit 117, each of the third and fourth switching elements SW3 and SW4 is maintained in an off state. Therefore, during the display mode DM, the first voltage output unit 111 outputs the normal gate low voltage VGL_N through the first switching element SW1 and the first node N1, and the normal gate low voltage ( VGL_N) is supplied to the external built-in gate driving circuit through the output terminal No of the second voltage output unit 117 and the signal supply line connected to the output terminal No.

Next, referring to FIGS. 3 and 5 , the touch power driving circuit according to an example of the present invention operates in the touch sensing mode (TM) according to the touch synchronization signal (Tsync) and generates a first gate through an output terminal (No). The low modulation voltage VGL_H and the second gate low modulation voltage VGL_L are alternately output.

Specifically, in the touch sensing mode (TM), the first switch driver 111a of the first voltage output unit 111 generates the low voltage lock signal UVLO of the first logic state H and the second logic state L The first and second switching control signals SS1 and SS2 of the second logic state are generated based on the touch synchronization signal Tsync of Accordingly, in the first voltage output unit 117, the first switching element SW1 is turned off by the first switching control signal SS1 in the second logic state, and the second switching element SW2 is turned off. It is maintained in the off state by the second switching control signal SS2 of the 2 logic state. At the same time, the second switch driver 117a of the second voltage output unit 117 generates the low voltage lock signal UVLO of the first logic state H and the touch synchronization signal Tsync of the second logic state L and The third switching control signal SS3 in which the first logic state and the second logic state alternate based on the touch pulse control signal PCS and the second logic state and the first logic state are synchronized with the third switching control signal SS3. A fourth switching control signal SS4 whose state is alternated is generated. Accordingly, in the second voltage output unit 117, each of the third and fourth switching elements SW3 and SW4 is alternately turned on/off. Therefore, during the touch sensing mode (TM), no voltage is output from the first voltage output unit 111 due to the turn-off of each of the first and second switching elements SW1 and SW2, and at the same time, the second voltage output unit ( 117), the first gate row modulation voltage VGL_H and the second gate row modulation voltage VGL_L are alternately connected to the output terminal No through the third and fourth switching elements SW3 and SW4, which are switched alternately with each other. The first gate row modulation voltage (VGL_H) and the second gate row modulation voltage (VGL_L) are alternately supplied to an external built-in gate driving circuit through a signal supply line connected to the output terminal (No). .

As such, the display mode DM and the touch sensing mode TM are alternately performed at least once.

Next, referring to FIGS. 3 and 6 , the touch power driving circuit according to an example of the present invention responds to the low voltage locking signal UVLO of the second logic state L when the power is turned off, and is in the panel discharge mode. It operates as (PM) and outputs the gate voltage (Vp_dis) for panel discharge through the output terminal (No).

Specifically, in the panel discharge mode (PM), the first switch driver 111a of the first voltage output unit 111 is in the second logic state based on the low voltage lock signal UVLO in the second logic state (L). A first switching control signal SS1 and a second switching control signal SS2 having a first logic state are generated. Accordingly, in the first voltage output unit 117, the first switching element SW1 is maintained in an off state by the first switching control signal SS1 in the second logic state, and the second switching element SW2 is It is turned on by the second switching control signal SS2 in the first logic state. At the same time, the second switch driver 117a of the second voltage output unit 117 generates third and fourth switching control signals in a second logic state based on the low voltage lock signal UVLO in a second logic state L. Generates (SS3, SS4). Accordingly, in the second voltage output unit 117, each of the third and fourth switching elements SW3 and SW4 is maintained in an off state. Therefore, during the panel discharge mode (PM), the first voltage output unit 111 outputs the gate voltage Vp_dis for panel discharge through the second switching element SW2 and the first node N1. The gate voltage Vp_dis is supplied to the external built-in gate driving circuit through the output terminal No of the second voltage output unit 117 and the signal supply line connected to the output terminal No.

As described above, the touch power driving circuit according to an example of the present invention generates a normal gate low voltage (VGL_N), a panel discharge gate voltage (Vp_dis), a first gate low modulation voltage (VGL_H) and a second gate voltage (VGL_H) according to a driving mode of a display panel. By supplying any one of the two gate row modulation voltages VGL_L to the external built-in gate driving circuit through one signal supply line, the number of channels can be reduced and the number of channels of the built-in gate driving circuit can be reduced.

Additionally, the first voltage output unit 111 may independently generate a normal gate low voltage VGL_L and a gate voltage Vp_dis for panel discharge. In this case, the first voltage output unit 111 may further include a normal gate low voltage generator (not shown) and a gate voltage generator for panel discharge (not shown). The normal gate low voltage generator includes a third digital-analog converter (not shown) generating a third reference voltage using third digital voltage data corresponding to the normal gate low voltage VGL_L stored in the non-volatile memory device. ), and a third operational amplifier (or buffer) (not shown) generating the normal gate low voltage VGL_L using the third reference voltage. The panel discharge gate voltage generator generates a fourth digital-analog voltage using fourth digital voltage data corresponding to the panel discharge gate voltage (Vp_dis) stored in the non-volatile memory device. A converter (not shown) and a fourth operational amplifier (or buffer) (not shown) generating a gate voltage (Vp_dis) for panel discharge using a fourth reference voltage may be included.

Optionally, the first voltage selector 111 may not be embedded in the gate voltage modulator 110 but may be embedded in a touch power driving circuit, that is, a power management circuit. In this case, the power management circuit unit generates a normal gate low voltage (VGL_N) and a gate voltage for panel discharge (Vp_dis), respectively, and generates the normal gate low voltage (VGL_N) and the gate voltage for panel discharge only according to the low voltage lock signal (UVLO). (Vp_dis) is selectively provided to the second voltage selector 117.

When the first voltage selector 111 is embedded in the power management circuit, the normal gate low voltage (VGL_N) and the gate voltage for panel discharge (Vp_dis) pass through the second voltage selector 117 to the built-in gate driving circuit. should be output. Accordingly, the second voltage selector 117 further includes a switch for outputting the normal gate low voltage VGL_N and the gate voltage Vp_dis for panel discharge, which are supplied only according to the low voltage lock signal UVLO from the power management circuit. and the second switch driver 117a additionally generates a fifth switching control signal for turning on the switch during the display mode and the panel discharge mode. Therefore, the normal gate low voltage VGL_N is supplied to the external built-in gate driving circuit through the switch of the second voltage selector 117, the output terminal No, and the signal supply line connected to the output terminal No, during the display mode. It can be. And, the gate voltage (Vp_dis) for panel discharge is output to the external built-in gate driving circuit through the switch of the second voltage selector 117 and the signal supply line connected to the output terminal (No) and the output terminal (No) during the panel discharge mode. can be supplied to

However, when the first voltage selector 111 is embedded in the power management circuit, the chip size of the second voltage selector 117 increases due to the area occupied by the switch within the second voltage selector 117. . That is, since the switch is composed of a plurality of second field effect transistors connected in parallel to have minimized on-resistance like the third and fourth switching elements, the second voltage selector 117 is a chip due to the addition of the switch. size will increase.

As a result, considering the increase in the chip size of the second voltage selector 117 due to the addition of the switch, the touch power driving circuit according to an example of the present invention uses the first voltage built into the gate voltage modulator 110 It is preferable to include the selection unit 111.

7 is a diagram for explaining an additional configuration of a touch power driving circuit according to an example of the present invention, and FIG. 8 is a driving waveform diagram of the touch power driving circuit shown in FIG. 7 , which is shown in FIGS. 2 to 6 A common voltage modulator is additionally configured in the touch power driving circuit. Accordingly, in the following description, only the common voltage modulator will be described, and the same reference numerals will be assigned to the remaining components, and redundant description thereof will be omitted.

Referring to FIGS. 7 and 8 , the touch power driving circuit according to an example of the present invention includes a common voltage modulator 120 modulating a voltage supplied to a data line and a touch electrode provided on a display panel according to a driving mode of the display panel. ) is further included. Here, the display panel further includes a data line crossing the gate line while overlapping the touch electrode, and a data driving circuit connected to the data line. In addition, the touch power driving circuit outputs the normal common voltage VcomN to the data driving circuit in the display mode DM, and alternates high voltages based on the normal common voltage VcomN in the touch sensing mode TM. The common voltage (VcomH) and low common voltage (VcomL) are output to the data driving circuit. Here, the normal common voltage VcomN is supplied to the touch electrode in the display mode (DM) so that the touch electrode serves as a common electrode. In addition, the high common voltage (VcomH) and the low common voltage (VcomL) may be defined as data load free signals for preventing a decrease in sensing sensitivity due to parasitic capacitance between a touch electrode and a data line in the touch sensing mode (TM). can Also, the high common voltage VcomH and the low common voltage VcomL may be used as touch electrode driving signals supplied to the touch electrodes in the touch sensing mode TM. In this case, a separate signal generation circuit for generating a touch electrode driving signal supplied to the touch electrode is not required.

The common voltage modulator 120 includes a high common voltage generator 121 , a low common voltage generator 123 , and a common voltage output unit 125 .

The high common voltage generator 121 generates a high common voltage VcomH having a preset voltage level. Here, the high common voltage VcomH may have a higher voltage level than the normal common voltage VcomN. For example, when the touch electrode driving signal supplied to the touch electrode has a voltage swing width swinging between the first voltage and the second voltage based on the normal common voltage VcomN, the high common voltage VcomH is It may have the same voltage level as 1 voltage.

The high common voltage generator 121 according to an embodiment generates a fifth digital-voltage reference voltage using fifth digital voltage data corresponding to the high common voltage VcomH stored in the non-volatile memory device. It may include an analog converter (not shown) and a fifth operational amplifier (or buffer) (not shown) generating a high common voltage (VcomH) using a fifth reference voltage.

The low common voltage generator 123 generates a low common voltage VcomL having a preset voltage level. Here, the low common voltage VcomL may have a lower voltage level than the normal common voltage VcomN. For example, when the touch electrode driving signal supplied to the touch electrode has a voltage swing width swinging between the first voltage and the second voltage based on the normal common voltage VcomN, the low common voltage VcomL is It can have the same voltage level as 2 voltage.

The low common voltage generator 123 according to an example generates a sixth digital voltage by using sixth digital voltage data corresponding to the low common voltage VcomL stored in the non-volatile memory device. An analog converter (not shown) and a sixth operational amplifier (or buffer) (not shown) generating a low common voltage VcomL using a sixth reference voltage may be included.

The common voltage output unit 125 outputs the normal common voltage VcomN during the display mode DM based on the low voltage lock signal UVLO, the touch synchronization signal Tsync, and the touch pulse control signal PCS. No), and the high common voltage VcomH and the low common voltage VcomL are alternately outputted to the output terminal No during the touch sensing mode TM. The common voltage output unit 125 according to an example includes a switching controller 125a, a fifth switching element SW5, a sixth switching element SW6, and a seventh switching element SW7.

The switching controller 125a turns on/off the fifth to seventh switching devices SW5, SW6, and SW7 based on the low voltage lock signal UVLO, the touch synchronization signal Tsync, and the touch pulse control signal PCS. to control That is, the switching control unit 125a generates different fifth to seventh switching control signals SS5 , SS6 , and SS7 based on the touch synchronization signal Tsync and the touch pulse control signal PCS. For example, the switching control unit 125a operates the fifth switching element SW5 during the display mode DM according to the low voltage lock signal UVLO in a first logic state and the touch synchronization signal Tsync in a first logic state. While generating the fifth switching control signal SS5 in the first logic state to turn on, the sixth switching control signal SS5 in the second logic state to turn off both the sixth switching element SW6 and the seventh switching element SW7 A switching control signal SS6 and a seventh switching control signal SS7 in the second logic state are respectively generated. Also, the switching controller 125a turns the fifth switching element SW5 during the touch sensing mode TM according to the low voltage lock signal UVLO in the first logic state and the touch sync signal Tsync in the second logic state. The sixth switching element SW6 and the seventh switching element SW7 are alternately switched off based on the touch pulse control signal PCS, while generating the fifth switching control signal SS5 in the second logic state for turning off. A sixth switching control signal SS6 in the first logic state and a seventh switching control signal SS7 in the first logic state are generated. Also, the switching control unit 125a is configured to turn off all of the fifth to seventh switching elements SW5, SW6, and SW7 during the panel discharge mode PM according to the low voltage locking signal UVLO in the second logic state. The fifth to seventh switching control signals SS5, SS6, and SS7 in logic states are respectively generated.

The switching control unit 125a according to an example performs a logical operation on the low voltage lock signal UVLO, the touch synchronization signal Tsync, and the touch pulse control signal PCS using a logic circuit (not shown) to perform a display mode and a touch sensing mode. The fifth to seventh switching control signals SS5, SS6, and SS7 respectively corresponding to each other are respectively generated.

The fifth switching element SW5 is connected between the output terminal No and the normal common voltage terminal and is switched according to the fifth switching control signal SS5 provided from the switching controller 125a. That is, the fifth switching element SW5 is turned on according to the fifth switching control signal SS5 in the first logic state and outputs the normal common voltage VcomN supplied from the outside through the normal common voltage terminal. ) is output as The fifth switching element SW5 is turned on only during the display mode (DM) and outputs a normal common voltage (VcomN), and is turned off during the touch sensing mode (TM) and the panel discharge mode (PM). maintain. The fifth switching element SW5 according to an example may be a field effect transistor.

The normal common voltage VcomN may be generated by an external power management circuit (not shown) and supplied to the normal common voltage terminal.

The sixth switching element SW6 is connected between the output terminal No and the high common voltage generator 121 and is switched according to the sixth switching control signal SS6 provided from the switching controller 125a. That is, the sixth switching element SW6 is turned on according to the sixth switching control signal SS6 in the first logic state and outputs the high common voltage VcomH supplied from the high common voltage generator 121 to the output terminal ( No) is output. The sixth switching element SW6 is turned on only during the touch sensing mode (TM) and outputs a high common voltage (VcomH), and is turned off during the display mode (DM) and the panel discharge mode (PM). maintain. The sixth switching element SW6 according to an example may be a field effect transistor.

The seventh switching element SW7 is connected between the output terminal No and the low common voltage generator 123 and is switched according to the seventh switching control signal SS7 provided from the switching controller 125a. That is, the seventh switching element SW7 is turned on according to the seventh switching control signal SS7 in the first logic state and outputs the low common voltage VcomL supplied from the low common voltage generator 123 to the output terminal ( No) is output. The seventh switching element SW7 is turned on only during the touch sensing mode (TM) and outputs a low common voltage (VcomL), and is turned off during the display mode (DM) and the panel discharge mode (PM). maintain. The seventh switching element SW7 according to an example may be a field effect transistor.

Each of the fifth to seventh switching elements (SW5, SW6, SW7) is formed of a plurality of field effect transistors connected in parallel to be simultaneously switched according to a switching control signal in order to minimize distortion of output voltage due to on-resistance, thereby reducing low may have an on resistance. For example, each of the fifth to seventh switching elements SW5 , SW6 , and SW7 may include dozens of field effect transistors connected in parallel.

As shown in FIG. 8 , the touch power driving circuit including the common voltage modulator 120 generates a low voltage locking signal UVLO of the first logic state H as the input power Vin is supplied. and operates in a display mode (DM) and a touch sensing mode (TM) in response to the touch synchronization signal (Tsync) and the touch pulse control signal (PCS), and when power is off, a low voltage of a second logic state (L) It operates in panel discharge mode (PM) in response to the locking signal (UVLO).

During the display mode (DM) of the display panel, the touch power driving circuit supplies the normal gate low voltage (VGL_N) to the built-in gate driving circuit through the gate voltage modulator 110 as described above. At the same time, the touch power driving circuit supplies the normal common voltage VcomN to the data driving circuit through the common voltage modulator 120 during the display mode DM. That is, during the display mode (DM), the switching controller 125a of the common voltage modulator 120 generates the low voltage lock signal UVLO in the first logic state H and the touch sync signal Tsync in the first logic state H. ), the fifth switching control signal SS5 in the first logic state and the sixth and seventh switching control signals SS6 and SS7 in the second logic state are generated. Accordingly, in the common voltage output unit 125, the fifth switching element SW5 is turned on by the fifth switching control signal SS5 in the first logic state, and the sixth switching element SW6 is turned on by the second switching element SW6. It is maintained in an off state by the sixth switching control signal SS6 in a logic state, and the seventh switching element SW7 is maintained in an off state by the seventh switching control signal SS7 in a second logic state.

Then, during the touch sensing mode (TM) of the display panel, the touch power driving circuit generates a first gate row modulation voltage VGL_H and a second gate row alternating voltage VGL_H through the gate voltage modulator 110 as described above. A modulation voltage (VGL_L) is generated and supplied to the built-in gate driving circuit. At the same time, the touch power driving circuit generates alternating high common voltages VcomH and low common voltages VcomL through the common voltage modulator 120 during the touch sensing mode TM and outputs them to the data driving circuit. That is, during the touch sensing mode (TM), the switching controller 125a of the common voltage modulator 120 outputs the low voltage locking signal UVLO of the first logic state H and the touch sync signal of the second logic state L. A fifth switching control signal SS5 having a first logic state is generated based on Tsync) and the touch pulse control signal PCS, and at the same time, a sixth switching control signal (which alternates between a first logic state and a second logic state) SS6) and the sixth switching control signal SS6, while generating a seventh switching control signal SS7 in which the second logic state and the first logic state alternate. Accordingly, in the common voltage modulator 120, each of the sixth and seventh switching elements SW6 and SW7 is alternately turned on/off. Therefore, in the common voltage modulator 120 during the touch sensing mode TM, the high common voltage VcomH and the low common voltage VcomL are generated through each of the sixth and seventh switching elements SW6 and SW7 that are alternately switched with each other. It is alternately output to the output terminal No, and the high common voltage VcomH and the low common voltage VcomL are supplied to the data driving circuit.

Subsequently, during the panel discharge mode (PM) of the display panel according to power off, the touch power driving circuit generates only the gate voltage Vp_dis for panel discharge through the gate voltage modulator 110 as described above. and supplied to the built-in gate driving circuit. At this time, the common voltage modulator 120 does not output any voltage. That is, during the panel discharge mode (PM), the switching control unit 125a of the common voltage modulator 120 generates the fifth to seventh second logic states based on the low voltage lock signal UVLO of the second logic state (L). The switching control signals SS5, SS6, and SS7 are generated. Accordingly, in the common voltage output unit 125, each of the fifth to seventh switching elements SW5, SW6, and SW7 enters a second logic state of the corresponding fifth to seventh switching control signals SS5, SS6, and SS7. By being turned off according to , the common voltage output unit 125 does not output any voltage.

As described above, the touch power driving circuit including the common voltage modulator 120 has the effect of the gate voltage modulator 110 as described above, and reduces the parasitic capacitance between the touch electrode and the data line in the touch sensing mode. A data load free signal for improving touch sensitivity may be provided to the data driving circuit.

FIG. 9 is a diagram for explaining a display device integrated with a touch screen according to an example of the present invention, and FIG. 10 is a waveform diagram illustrating signals applied to the display panel shown in FIG. 9 .

9 and 10, a touch screen integrated display device according to an example of the present invention includes a display panel 200, a built-in gate driving circuit 210, a timing controller 300, a driving power supply unit 400, a low voltage It includes a detection circuit 450 , a host controller 500 , a touch driving signal supplier 600 , a touch driver 700 , and a data driving circuit 800 .

The display panel 200 may be a liquid crystal display panel including an in-cell touch type touch electrode TE using a self-capacitance method. The display panel 200 may operate in a display mode (DM) and a touch sensing mode (TM) under the control of the timing controller 300 . For example, the display panel 200 displays an image using light emitted from a backlight unit (not shown) during the display mode (DM). In addition, the display panel 200 serves as a touch panel for touch sensing according to the capacitance change of the touch electrode TE during the touch sensing mode TM.

The display panel 200 according to an example includes a plurality of data lines DL1 to DLn, a plurality of gate lines GL1 to GLm, a plurality of sub-pixels SP, a plurality of touch routing lines TL1 to TLk, and a plurality of gate lines GL1 to GLm. of the touch electrode TE, and a built-in gate driving circuit 210 .

The plurality of data lines DL1 to DLn and the plurality of gate lines GL1 to GLm may be provided to cross each other on a substrate (not shown) to define a plurality of pixel areas.

The plurality of data lines (DL1 to DLn) are provided parallel to a second horizontal axis direction (Y) intersecting the first horizontal axis direction (X) while having regular intervals along the first horizontal axis direction (X). . The plurality of data lines DL1 to DLn receive the data load free signal LFS1 from the data driving circuit 800 in the touch sensing mode (TM), and receive data from the data driving circuit 800 in the display mode (DM). Receives signal Vdata.

The plurality of gate lines GL1 to GLm are provided at regular intervals along the second horizontal axis direction Y while parallel to the first horizontal axis direction X to cross the plurality of data lines DL1 to DLn. The plurality of gate lines GL1 to GLm receive the gate high voltage from the built-in gate driving circuit 210 during the scan period in the display mode (DM), and the built-in gate drive circuit 210 during the rest of the display period except for the scan period. Receives the normal gate low voltage from Also, the plurality of gate lines GL1 to GLm receive the gate load free signal LFS2 from the built-in gate driving circuit 210 in the touch sensing mode TM.

Each of the plurality of sub-pixels SP includes a thin film transistor (not shown), a pixel electrode (not shown), and a storage capacitor (not shown).

The thin film transistor includes a gate electrode, a semiconductor layer, and source/drain electrodes, and may have a bottom gate structure in which the gate electrode is positioned below the semiconductor layer, or the gate electrode is positioned on the semiconductor layer. It may also consist of a top gate structure. A gate electrode and a source electrode of the thin film transistor are respectively connected to a gate line GL and a data line defining a corresponding subpixel. This thin film transistor is covered by a protective layer (or planarization layer), not shown.

The pixel electrode is provided on the passivation layer in the pixel area and is connected to the drain electrode of the thin film transistor through a via hole provided in the passivation layer. The pixel electrode may include a transparent conductive material such as indium tin oxide (ITO).

Although not shown, the pixel electrode according to an example may include at least one slit therein. In this case, a fringe field is formed between the pixel electrode and the touch electrode TE through the slit. ) is formed, and the liquid crystal can be driven in a fringe field switching mode by this fringe field.

Although not shown, a pixel electrode according to another example may include a plurality of pixel finger patterns having regular intervals. In this case, although not shown, the sub-pixel SP may further include a plurality of common finger patterns spaced apart from each of the plurality of pixel finger patterns and provided parallel to each other and connected to the touch electrode TE. A horizontal electric field is formed between the plurality of common finger patterns and the plurality of pixel finger patterns, and the liquid crystal may be driven in an in-plane switching mode by the horizontal electric field.

The storage capacitor may be formed between a thin film transistor and a touch electrode or between a pixel electrode and a touch electrode. The storage capacitor charges the data signal during the scan period and maintains an electric field formed between the pixel electrode and the touch electrode by using the charged voltage during the display period.

Each of the plurality of touch routing lines TL1 to TLk is provided in the same shape as the data line DL in each pixel area on the passivation layer, and is individually connected to each of the plurality of touch electrodes TE. Each of the plurality of touch routing lines TL1 to TLk receives a normal common voltage VcomN in the display mode DM and receives a first voltage symmetrical based on the normal common voltage VcomN in the touch sensing mode TM. A touch electrode driving signal TDS having a plurality of driving pulses swinging with a first voltage swing width between V1 and the second voltage V1 is received. Here, the first and second voltages V1 and V2 may be a high common voltage VcomH and a low common voltage VcomL alternately provided from the touch driving signal supply unit 600 .

Each of the plurality of touch electrodes TE serves as a sensing electrode for sensing a user's touch or serves to drive liquid crystal by forming an electric field together with a pixel electrode. That is, each of the plurality of touch electrodes TE is used as a sensing electrode in the touch sensing mode (TM) and used as a common electrode in the display mode (DM). Since each of the plurality of touch electrodes TE is also used as a common electrode for driving the liquid crystal, it may include a transparent conductive material such as indium tin oxide (ITO).

Since each of the plurality of touch electrodes TE is used as a self-capacitance sensing electrode in the touch sensing mode TM, it must have a minimum size for touch sensing. Accordingly, each of the plurality of touch electrodes TE may have a size corresponding to one or more subpixels SP.

The built-in gate driving circuit 210 is embedded (or integrated) in the left and/or right non-display areas of the display panel 200 so as to be connected to one end or/and the other end of each of the plurality of gate lines GL1 to GLm. can That is, the embedded gate driving circuit 210 may be embedded (or integrated) in the left and/or right non-display areas of the display panel 200 together with the manufacturing process of the thin film transistor provided in the sub-pixel.

The built-in gate driving circuit 210 according to an example applies a gate high voltage VGH to a plurality of gate lines ( GL1 to GLm), and then sequentially supply the normal gate low voltage (VGL_N) provided from the touch driving signal supply unit 600 to the plurality of gate lines GL1 to GLm during the rest of the display period except for the scan period By doing so, the thin film transistors connected to each of the plurality of gate lines GL1 to GLm are turned on in units of one horizontal period of the display panel 200 .

In addition, the built-in gate driving circuit 210 responds to the gate control signal GCS supplied from the timing controller 300 during the touch sensing mode TM, and the gate load free signal LFS2 supplied from the touch driving signal supply unit 600. ) is simultaneously supplied to the plurality of gate lines GL1 to GLm. Here, the gate load free signal LFS2 is a first gate row modulation voltage VGL_H and a second gate row modulation voltage VGL_L alternately outputted from the touch driving signal supply unit 600 during the touch sensing mode TM. include The gate load free signal LFS2 has the same first voltage swing width with the same phase as the touch electrode driving signal TDS.

In addition, the built-in gate driving circuit 210 simultaneously supplies the gate voltage Vp_dic for panel discharge from the touch driving signal supply unit 600 to the plurality of gate lines GL1 to GLm during the panel discharge mode (PM), so that when the power is turned off By turning on the thin film transistor of each sub-pixel, the charge charged in the sub-pixel SP is quickly discharged.

The timing controller 300 receives a timing synchronization signal (TSS) such as a data enable signal, a reference clock signal, a vertical synchronization signal (Vsync), and a horizontal synchronization signal supplied from an external display driving system (not shown), and , The received vertical synchronization signal Vsync is provided to the host controller 500 and the touch synchronization signal Tsync is received from the host controller 500 . The timing controller 300 controls the display panel 200 to display mode DM and touch sensing mode DM based on the touch sync signal Tsync.

The timing controller 300 receives image data Idata supplied from the display driving system, and converts the image data Idata to pixel data R/G for each display mode DM to be suitable for driving the display panel 200. /B) and provided to the data driving circuit 800.

The timing controller 300 generates a gate control signal (GCS) and a data control signal (DCS) based on the timing synchronization signal (TSS) to drive the built-in gate driving circuit 210 and the data driving circuit 800, respectively. Control.

The driving power supply 400 generates driving power necessary for driving the display device using input power Vin from the outside. In particular, the driving power supply 400 generates the normal gate low voltage VGL_N, the gate voltage Vp_dis for panel discharge, and the normal common voltage VcomN, respectively, and provides them to the touch driving signal supply unit 600 . The driving power supply 400 may be a power management integrated circuit mounted on a power supply board (not shown) of the display device.

The low voltage detection circuit 450 generates the low voltage lock signal UVLO according to the voltage level of the input power supply Vin. For example, the low voltage detection circuit 450 generates the low voltage lock signal UVLO in the first logic state H when the voltage level of the input power source Vin is equal to or higher than the reference voltage level, and When the voltage level is less than the reference voltage level, the low voltage lock signal UVLO of the second logic state L that is inverted from the first logic state may be generated.

The host controller 500 is a Micro Controller Unit (MCU) and generates a touch synchronization signal Tsync and a touch pulse control signal PCS based on the vertical synchronization signal Vsync provided from the timing controller 300. .

The touch pulse control signal PCS is based on the output period of the first gate low modulation voltage VGL_H and the second gate low modulation voltage VLG_L alternately output from the touch driving signal supply unit 600 and the high common voltage VcomH. ) and a signal for controlling the output cycle of the low common voltage VcomL.

The touch synchronization signal Tsync may be defined as a mode selection signal for operating the display panel 200 in the display mode DM and the touch sensing mode DM. At this time, the host controller 500 time-divides each frame of the display panel 200 into at least one subframe based on the vertical synchronization signal Vsync, and divides each subframe into a display mode DM and a touch sensing mode TM ) to increase the touch sensing cycle by generating a touch sync signal Tsync for driving.

The host controller 500 calculates touch location information based on touch raw data Tdata provided from the touch driver 700 and executes an application program linked to the calculated touch location information.

The host controller 500 may be embedded in the timing controller 200 or the touch driver 700, and in this case, the number of parts and the connection structure between components of the display device according to the present invention may be simplified.

Alternatively, the touch synchronization signal Tsync and the touch pulse control signal PCS may be generated by the timing controller 200 instead of by the host controller 500 .

The touch driving signal supply unit 600 generates a normal gate low voltage (VGL_N) and a normal gate low voltage (VGL_N) according to the driving mode of the display panel 200 according to the low voltage lock signal (UVLO), the touch synchronization signal (Tsync), and the touch pulse control signal (PCS). One of the gate voltage Vp_dis for panel discharge, the first gate row modulation voltage VGL_H, and the second gate row modulation voltage VLG_L is selected and supplied to the built-in gate driving circuit 210 . Since the touch driving signal supplier 600 has the same configuration as the touch power driving circuit shown in FIGS. 2 to 8 , a detailed description thereof will be omitted.

The touch driving signal supply unit 600 supplies the normal gate low voltage VGL_N to the built-in gate driving circuit 210 through the gate voltage modulator 110 during the display mode DM, and at the same time, the common voltage The normal common voltage VcomN is supplied to the touch driver 700 through the modulator 120 .

In addition, the touch driving signal supply unit 600 generates a first gate row modulation voltage VGL_H and a second gate row modulation voltage VGL_L that are alternated with each other through the gate voltage modulator 110 during the touch sensing mode DM. ) is supplied to the built-in gate driving circuit 210, and at the same time, the high common voltage (VcomH) and the low common voltage (VcomL) alternating with each other through the common voltage modulator 120 are driven by the touch driver 700 and data Commonly supplied to each of the circuits 800. Here, the alternating first gate row modulation voltage VGL_H and the second gate row modulation voltage VGL_L prevent a decrease in sensing sensitivity due to parasitic capacitance between the touch electrode TE and the gate lines GL1 to GLm. To do this, it is used as the gate load free signal LFS2 supplied to all gate lines GL1 to GLm during the touch sensing mode TM. In addition, the alternating high common voltage VcomH and low common voltage VcomL are used in the touch sensing mode to prevent deterioration of sensing sensitivity due to parasitic capacitance between the touch electrode TE and the data lines GL1 to GLm. It is used as a data load free signal (LFS1) supplied to all data lines (DL1 to DLn) during (TM). In addition, the alternating high common voltage VcomH and low common voltage VcomL are used as touch electrode driving signals TDS supplied to each of the plurality of touch electrodes TE in the touch sensing mode TM.

In addition, the touch driving signal supply unit 600, in the panel discharge mode (PM) according to the low voltage lock signal (UVLO) of the second logic state (L), gate voltage for panel discharge through the gate voltage modulator 110 (Vp_dis) is supplied to the built-in gate driving circuit 210.

The touch driver 700 is connected to the plurality of touch electrodes TE on a one-to-one basis through a plurality of touch routing lines TL1 to TLk provided on the display panel 200 .

The touch driver 700 receives a normal common signal provided from the touch driving signal supplier 600 during the display mode DM according to the touch synchronization signal Tsync of the first logic state H supplied from the host controller 500. The voltage VcomN is received, and the normal common voltage VcomN is supplied to each of the plurality of touch electrodes TE through each of the touch routing lines TL1 to TLk.

The touch driver 700 is alternately supplied from the touch driving signal supplier 600 during the touch sensing mode TM according to the touch synchronization signal Tsync of the second logic state L supplied from the host controller 500. The high common voltage VcomH and the low common voltage VcomL are received, and the touch electrode driving signal DS having a pulse form is generated by alternating the high common voltage VcomH and the low common voltage VcomL. After supplying to each of the plurality of touch electrodes (TE) through each of the touch routing lines (TL1 to TLk), sensing the capacitance change of the corresponding touch electrode (TE) through each of the plurality of touch routing lines (TL1 to TLk) Then, touch raw data Tdata is generated, and the generated touch raw data Tdata is provided to the host controller 500 .

The data driving circuit 800 operates in a display mode DM and a touch sensing mode TM in response to a touch sync signal Tsync supplied from the host controller 500 . For example, the data driving circuit 800 includes pixels supplied from the timing controller 300 in units of one horizontal period during the display mode DM according to the touch synchronization signal Tsync of the first logic state H. The data R/G/B is converted into an analog data signal Vdata and simultaneously supplied to a plurality of data lines DL1 to DLn. Also, the data driving circuit 800 has a high common voltage alternately supplied from the touch driving signal supplier 600 during the touch sensing mode TM according to the touch synchronization signal Tsync of the second logic state L. A data load free signal LFS1 having a pulse shape is simultaneously supplied to a plurality of data lines DL1 to DLn by alternating between (VcomH) and low common voltage (VcomL).

FIG. 11 is a diagram for explaining the touch driver shown in FIG. 9 .

Referring to FIGS. 9 to 11 , a touch driver 700 according to an example includes a first switching unit 710 , a touch sensing unit 730 , and a touch data processing unit 750 .

The first switching unit 710 generates a normal common voltage (VcomN) for each of the plurality of touch routing lines TL1 to TLk based on the touch synchronization signal Tsync and the channel selection signal Tcss supplied from the host controller 500. ) or the touch electrode driving signal TDS is supplied, or each of the plurality of touch routing lines TL1 to TLk is connected to the touch sensing unit 730 . Here, the channel selection signal Tcss is a channel individual selection signal for individually performing touch sensing on a plurality of touch electrodes TE or performing group touch sensing by grouping at least two or more touch electrodes TE. may be a channel group selection signal for The first switching unit 710 according to an example includes a plurality of first switching elements 712 that are switched according to the touch synchronization signal Tsync and the channel selection signal Tcss.

Each of the plurality of first switching elements 712 has a normal common voltage (VcomN) supplied from the touch driving signal supply unit 600 during the display mode (DM) according to the touch synchronization signal (Tsync) in the first logic state (H). ) is supplied to each of the plurality of touch routing lines TL1 to TLk, so that the plurality of touch electrodes TE serve as a common electrode.

Further, each of the plurality of first switching elements 712 is alternately supplied from the touch driving signal supply unit 600 during the touch sensing mode TM according to the touch synchronization signal Tsync of the second logic state L. A touch electrode driving signal TDS having a pulse form by alternating high common voltage VcomH and low common voltage VcomL is supplied to a corresponding touch electrode TE through each of a plurality of touch routing lines TL1 to TLk After that, each of the plurality of touch routing lines TL1 to TLk is connected to the touch sensing unit 730 according to the channel selection signal Tcss.

The touch sensing unit 730 uses the touch electrode driving signal TDS as a reference voltage during the touch sensing mode TM to sense a touch signal according to the change in capacitance of the touch electrode TE to generate touch raw data Tdata. ) is generated, and the generated touch raw data Tdata is provided to the host controller 500 . At this time, the touch sensing unit 730 performs individual touch sensing on the plurality of touch electrodes TE in response to the channel individual selection signal, and performs group touch sensing on the plurality of touch electrodes TE in response to the channel group selection signal. Touch sensing can be performed. The touch sensing unit 320 according to an example includes a plurality of sensing units SU.

Each of the plurality of sensing units SU may include a touch sensing circuit (not shown) and an analog-to-digital converter (not shown).

The touch sensing circuit generates a touch signal by amplifying capacitance variation of the touch electrode TE through each touch routing line TL1 to TLk. The touch sensing circuit according to an example may be an integrator (not shown) including a comparator that compares a signal received from each of the touch routing lines TL1 to TLk with a reference voltage and outputs the result.

An integrator according to an example may include an operational amplifier (not shown) including an inverting terminal, a non-inverting terminal, and an output terminal, and a feedback capacitor (not shown) connected between the inverting terminal and the output terminal of the operational amplifier. Here, inverting terminals of the integrator are connected to the touch electrodes TE through corresponding touch routing lines TL1 to TLk. A non-inverting terminal of the integrator receives the touch electrode driving signal TDS as a reference voltage.

The analog-to-digital converter converts an analog output signal output from the touch sensing circuit into a digital signal to generate touch row data Tdata.

The touch data processing unit 750 temporarily stores the touch raw data Tdata supplied from the touch sensing unit 730 in an internal memory (not shown), and in response to a touch report signal, stores the touch raw data Tdata stored in the internal memory. ) is provided to the host control unit 500.

As such, the touch driver 700 according to an example uses the high common voltage VcomH and the low common voltage VcomL alternately supplied from the touch driving signal supply unit 600 as the touch electrode driving signal TDS. Therefore, a separate circuit for generating the touch electrode driving signal TDS by itself is not required, and as a result, the chip size can be reduced.

FIG. 12 is a diagram for explaining the data driving circuit shown in FIG. 9 .

Referring to FIGS. 9, 10, and 12 , a data driving circuit 800 according to an example includes a second switching unit 810 and a data signal supply unit 830.

The second switching unit 810 connects each of the plurality of data lines DL1 to DLn to the data signal supply unit 830 based on the touch synchronization signal Tsync supplied from the host controller 500 or A data load free signal LFS1 is supplied to each of the lines DL1 to DLn. Here, the data load free signal LFS1 has a pulse shape by alternating high common voltage VcomH and low common voltage VcomL alternately supplied from the touch driving signal supply unit 600 . The second switching unit 810 according to an example includes a plurality of second switching elements 812 that are switched according to the touch synchronization signal Tsync.

Each of the plurality of second switching elements 812 supplies each of the plurality of data lines DL1 to DLn to a data signal supply unit ( 830), the data signal Vdata output from the data signal supply unit 830 is supplied to the corresponding data lines DL1 to DLn.

Further, each of the plurality of second switching elements 812 is alternately supplied from the touch driving signal supplier 600 during the touch sensing mode TM according to the touch synchronization signal Tsync of the second logic state L. The pulse-shaped data load free signal LFS1 is supplied to all data lines DL1 to DLn by alternating high common voltage VcomH and low common voltage VcomL.

The data signal supply unit 830 receives the pixel data (R/G/B) and the data control signal (DCS) of each sub-pixel supplied from the timing controller 300, and receives the data control signal (DCS) for each pixel. The data R/G/B is converted into an analog data signal Vdata and supplied to corresponding data lines DL1 to DLn through the second switching unit 810 . The data signal supply unit 830 according to an example includes a receiver (not shown) that receives pixel data R/G/B and a data control signal DCS of each sub-pixel, and a shift register unit that sequentially outputs a sampling signal. (not shown), a latch unit (not shown) that latches pixel data (R/G/B) of each sub-pixel according to a sampling signal, and grayscale voltage generation that generates a plurality of grayscale voltages by subdividing a plurality of reference gamma voltages. (not shown) converts the pixel data (R/G/B) of each sub-pixel output from the latch unit into an analog data signal (Vdata) using a plurality of grayscale voltages, and converts the digital-to-analog conversion unit (not shown). time), and an output buffer unit (not shown) outputting the data signal Vdata to the second switching unit 810 .

As such, the data signal supply unit 830 of the data driving circuit 800 may be composed of a data driving integrated circuit. In this case, the second switching unit 810 is built into the data driving integrated circuit or external to the data driving integrated circuit. can be placed in

Additionally, the data driving circuit 800 according to an example may include a touch driver 700 . That is, the touch driver 700 may be one touch driving device (or touch driving integrated circuit) including the data driving circuit 800 .

FIG. 13 is a diagram for explaining the built-in gate driving circuit shown in FIG. 9 .

Referring to FIGS. 9, 10, and 13 , the embedded gate driving circuit 210 according to an example may include a shift register including a plurality of stages ST1 to STm dependently connected to each other.

Each of the plurality of stages ST1 to STm is scanned according to a gate start pulse VST, a clock signal CLK, and a reset signal Reset included in the gate control signal GCS output from the timing controller 300. After sequentially supplying the gate high voltage (or scan pulse) VGH corresponding to the clock signal CLK to the plurality of gate lines GL1 to GLm during the period, the touch driving signal supply unit for the rest of the display period except for the scan period The normal gate low voltage VGL_N supplied to the gate low voltage line VGLL from 600 is sequentially supplied to the plurality of gate lines GL1 to GLm.

The gate low voltage line VGLL connected to each of the plurality of stages ST1 to STm receives the normal gate low voltage VGL_N supplied from the touch driving signal supply unit 600 during the display mode DM, and touch sensing. receiving a gate load free signal LFS2 corresponding to a first gate row modulation voltage VGL_H and a second gate row modulation voltage VGL_L alternately output from the touch driving signal supply unit 600 during the mode TM; , The panel discharge gate voltage Vp_dis supplied from the touch driving signal supply unit 600 is received during the panel discharge mode (PM). Here, the gate load free signal LFS2 has the same first voltage swing width with the same phase as the touch electrode driving signal TDS.

As described above, the built-in gate driving circuit 210 according to an example transmits the gate load free signal LFS2 supplied from the touch driving signal supply unit 600 to the gate low voltage line VGLL during the touch sensing mode TM to a plurality of By supplying the touch electrode TE to the gate lines GL1 to GLm, a decrease in sensing sensitivity due to parasitic capacitance between the touch electrode TE and the gate lines GL1 to GLm is prevented. In particular, the built-in gate driving circuit 210 according to an example generates a gate voltage Vp_dis for panel discharge supplied from the touch driving signal supplier 600 to the gate low voltage line VGLL in the panel discharge mode PM according to power off. ) is supplied to the plurality of gate lines GL1 to GLm to quickly discharge the charges charged in the sub-pixels SP, thereby preventing problems due to afterimages when the power is turned off.

As described above, the present invention generates a normal gate low voltage supplied to a gate line of a display panel, first and second gate low modulation voltages, and a gate voltage for panel discharge according to a driving mode of a display panel in a touch power driving circuit. By supplying the signals to the built-in gate driving circuit through one signal supply line, the number of channels of the touch power driving circuit can be reduced. In addition, the present invention generates a data load free signal and a gate load free signal for preventing a decrease in sensing sensitivity due to parasitic capacitance between a gate line, a data line, and a touch electrode in a touch sensing mode in a touch power driving circuit, thereby sharing components. or can be simplified.

The present invention described above is not limited to the above-described embodiments and the accompanying drawings, and it is common in the technical field to which the present invention belongs that various substitutions, modifications, and changes are possible without departing from the technical details of the present invention. It will be clear to those who have knowledge of Therefore, the scope of the present invention is indicated by the following claims, and all changes or modifications derived from the meaning and scope of the claims and equivalent concepts should be construed as being included in the scope of the present invention.

110: gate voltage modulator 111: first voltage output unit
113: first gate low voltage generator 115: second gate low voltage generator
117: second voltage output unit 120: common voltage modulator
121: high common voltage generator 123: low common voltage generator
125: common voltage output unit 200: display panel
210: built-in gate driving circuit 300: timing controller
400: driving power supply unit 450: low voltage detection circuit
500: host control unit 500: touch driving signal supply unit
700: touch driver 800: data driving circuit

Claims (13)

A gate voltage modulator for generating a voltage selectively supplied to a gate line provided in the display panel according to a driving mode of the display panel;
The gate voltage modulator,
a first voltage output unit outputting a normal gate low voltage or a gate voltage for panel discharge based on the low voltage lock signal and the touch synchronization signal;
a first gate voltage generator generating a first gate row modulation voltage higher than the normal gate row voltage;
a second gate voltage generator configured to generate a second gate row modulation voltage lower than the normal gate row voltage; and
one of a voltage output from the first voltage output unit based on the low voltage lock signal, the touch sync signal, and the touch pulse control signal, the first gate row modulation voltage, and the second gate row modulation voltage, to an output terminal; And a second voltage output unit for outputting,
The first voltage output unit,
a first switch driver generating different first switching control signals and second switching control signals based on the low voltage lock signal and the touch synchronization signal;
a first switching element that is turned on according to the first switching control signal and outputs the normal gate low voltage to an output terminal of the second voltage output unit; and
and a second switching element that is turned on according to the second switching control signal and outputs the gate voltage for discharging the panel to an output terminal of the second voltage output unit. delete According to claim 1,
the first switching element is turned on only during a display mode of the display panel;
wherein the second switching element is turned on only during the panel discharge mode of the display panel. According to claim 1,
The second voltage output unit,
a second switch driver configured to generate a third switching control signal and a fourth switching control signal that are different from each other based on the low voltage lock signal, the touch synchronization signal, and the touch pulse control signal;
a third switching element turned on according to the first switching control signal to output the first gate row modulation voltage to the output terminal; and
and a fourth switching element turned on according to the second switching control signal to output the second gate low modulation voltage to the output terminal. According to claim 4,
Each of the third switching element and the fourth switching element,
turned off both during the display mode of the display panel and during the panel discharge mode;
A touch power driving circuit that is alternately switched during the touch sensing mode of the display panel. According to claim 4,
Each of the first switching element and the second switching element has a plurality of first transistors connected in parallel;
The touch power driving circuit, wherein each of the third switching element and the fourth switching element includes a plurality of second transistors connected in parallel. According to claim 6,
The number of the second transistors is greater than the number of the first transistors, the touch power driving circuit. The method according to any one of claims 1 and 3 to 7,
A common voltage modulator for generating a voltage selectively supplied to a data line provided in the display panel according to a driving mode of the display panel;
The common voltage modulator,
a high common voltage generating unit generating a high common voltage higher than the normal common voltage;
a low common voltage generator configured to generate a low common voltage lower than the normal common voltage; and
and a common voltage output unit configured to output one of the normal common voltage, the high common voltage, and the low common voltage based on the touch synchronization signal and the touch pulse control signal. According to claim 8,
The common voltage output unit,
outputting the normal common voltage during a display mode of the display panel;
A touch power driving circuit that alternately outputs the high common voltage and the low common voltage based on the touch pulse control signal during a touch sensing mode of the display panel. a display panel having gate lines, data lines, and touch electrodes;
a built-in gate driving circuit embedded in the display panel and connected to the gate line; and
Any one of a normal gate low voltage, a gate voltage for panel discharge, a first gate low modulation voltage, and a second gate low modulation voltage according to the driving mode of the display panel according to the low voltage lock signal, touch synchronization signal, and touch pulse control signal And a touch driving signal supply unit for selecting and supplying the selected gate driving circuit to the embedded gate driving circuit.
The touch driving signal supply unit having a touch power driving circuit according to any one of claims 1 and 3 to 7, the touch screen integrated display device. According to claim 10,
The built-in gate driving circuit,
supplying the gate high voltage to the gate line and then supplying the normal gate low voltage to the gate line during a display mode of the display panel;
alternately supplying the first gate row modulation voltage and the second gate row modulation voltage to the gate line during a touch sensing mode of the display panel;
A touch screen integrated display device that supplies a gate voltage for panel discharge to the gate line during a panel discharge mode of the display panel. According to claim 10,
a touch driver supplying a normal common voltage to the touch electrodes during a display mode of the display panel and generating touch raw data by sensing a touch through the touch electrodes during a touch sensing mode of the display panel;
a data driving circuit supplying a data signal to the data line during the display mode and alternately supplying a high common voltage and a low common voltage to the data line during the touch sensing mode;
a driving power supply unit configured to generate the normal gate low voltage, the gate voltage for panel discharge, and the normal common voltage by using input power;
a low voltage detection circuit generating the low voltage lock signal according to the voltage level of the input power; and
and a host controller configured to generate the touch synchronization signal and the touch pulse control signal and touch information based on touch raw data supplied from the touch driver. According to claim 12,
The touch power driving circuit further includes a common voltage modulator,
The common voltage modulator,
a high common voltage generating unit generating a high common voltage higher than the normal common voltage;
a low common voltage generator configured to generate a low common voltage lower than the normal common voltage; and
a common voltage output unit configured to supply one of the normal common voltage, the high common voltage, and the low common voltage to the touch driver and the data driving circuit based on the touch sync signal and the touch pulse control signal; All-in-one display device.

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