KR102628784B1 - Display apparatus with touch panel - Google Patents

Abstract

The purpose of the present invention is to provide a voltage change control signal that converts the level of the touch signal from high voltage to low voltage, divided into two signals, and the two signals can be transmitted from the touch control unit to the power supply unit at different timings. , to provide a display device equipped with a touch panel.

Description

Display device equipped with a touch panel {DISPLAY APPARATUS WITH TOUCH PANEL}

The present invention relates to a display device equipped with a touch panel.

In a display device using a touch panel, the display period in which an image is output and the touch period in which a touch is sensed are repeated several times during one frame period. Additionally, during the touch period, at least one of finger touch sensing, which senses a touch with a finger, and pen touch sensing, which senses a touch with a pen, may be performed.

When both finger touch sensing and pen touch sensing are performed during the one touch period, pen touch sensing is generally performed first, and then finger touch sensing is performed.

In this case, during pen touch sensing, a touch signal with a high voltage must be supplied to the touch panel to effectively perform sensing, and during finger touch sensing, a low voltage lower than the high voltage must be supplied to the touch panel to effectively perform sensing. .

To this end, when the pen touch sensing is converted to the finger touch sensing, a voltage change control signal that converts the voltage of the touch signal from the high voltage to the low voltage must be transmitted to the power supply unit.

However, because the time required to transmit the voltage change control signal is longer than the time to switch from pen touch sensing to finger touch sensing, in a conventional display device, even when finger touch sensing is performed after pen touch sensing, the high voltage is applied to the touch. There is a problem with it being used as a signal.

The purpose of the present invention proposed to solve the above-described problem is that the voltage change control signal that converts the level of the touch signal from high voltage to low voltage is divided into two signals, and the two signals touch at different timings. The aim is to provide a display device equipped with a touch panel that can transmit data from a control unit to a power supply unit.

A display device equipped with a touch panel according to the present invention for achieving the above-described technical problem includes a display panel provided with pixels for displaying images, a touch panel provided on the display panel and provided with touch electrodes, and the touch panel. A touch driver that supplies a touch signal to the panel, a power supply unit that supplies a touch driving voltage used to generate the touch signal to the touch driver, and a high level voltage of the touch signal that is converted from the first level of the first voltage to the second voltage. A voltage change control signal for conversion to a second level is divided into two signals, and a touch control unit transmits the two signals to the power supply unit at different timings. The first level is a higher voltage than the second level, and the power supply unit transmits a touch driving voltage corresponding to the voltage change control signal to the touch driver.

According to the present invention, high voltage for pen touch sensing and low voltage for finger touch sensing can be accurately output to the touch electrodes during the pen touch sensing period and the finger touch sensing period.

Therefore, according to the present invention, the sensitivity of pen touch sensing and finger touch sensing can be improved.

1 is an exemplary diagram showing the configuration of a display device equipped with a touch panel according to the present invention.
Figure 2 is an example diagram showing the structure of a pixel applied to a display device equipped with a touch panel according to the present invention.
Figure 3 is an exemplary diagram showing the structure of a control unit applied to a display device equipped with a touch panel according to the present invention.
Figure 4 is an exemplary diagram showing the structure of a touch driver applied to a display device equipped with a touch panel according to the present invention.
Figure 5 is an example diagram showing how the touch period and display period are repeated in the display device according to the present invention.
Figure 6 is an example diagram showing how pen touch sensing and finger touch sensing are performed in the display device according to the present invention.
FIG. 7 is an example diagram showing signals transmitted from the touch control unit to the power supply unit during pen touch sensing and finger touch sensing shown in FIG. 6.
Figure 8 is an example diagram for explaining the duration and output timing of signals generated in the display device according to the present invention.

The advantages and features of the present invention and methods for achieving them will become clear by referring to the embodiments described in detail below along with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below and will be implemented in various different forms. These embodiments only serve to ensure that the disclosure of the present invention is complete, and those skilled in the art It is provided to fully inform the person of the scope of the invention, and the present invention is only defined by the scope of the claims.

In this specification, it should be noted that when adding reference numbers to components in each drawing, the same components are given the same number as much as possible even if they are shown in different drawings.

The shapes, sizes, ratios, angles, numbers, etc. disclosed in the drawings for explaining embodiments of the present invention are illustrative, and the present invention is not limited to the matters shown. Like reference numerals refer to like elements throughout the specification. Additionally, in describing the present invention, if it is determined that a detailed description of related known technologies may unnecessarily obscure the gist of the present invention, the detailed description will be omitted. When 'includes', 'has', 'consists of', etc. mentioned in this specification are used, other parts may be added unless 'only' is used. When a component is expressed in the singular, the plural is included unless specifically stated otherwise.

When interpreting a component, it is interpreted to include the margin of error even if there is no separate explicit description.

In the case of a description of a positional relationship, for example, if the positional relationship of two parts is described as 'on top', 'on the top', 'on the bottom', 'next to', etc., 'immediately' Alternatively, there may be one or more other parts placed between the two parts, unless 'directly' is used.

In the case of a description of a temporal relationship, for example, if a temporal relationship is described as 'after', 'successfully after', 'after', 'before', etc., 'immediately' or 'directly' Unless used, non-consecutive cases may also be included.

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 each of the first item, the second item or the third item, as well as two of the first item, the second item and the third item. It means a combination of all items that can be presented from more than one.

Although first, second, etc. are used to describe various components, these components are not limited by these terms. These terms are merely used to distinguish one component from another. Accordingly, the first component mentioned below may also be the second component within the technical spirit of the present invention.

Each feature of the various embodiments of the present invention can be partially or fully combined or combined with each other, various technical interconnections and operations are possible, and each embodiment can be implemented independently of each other or together in a related relationship. It may be possible.

Hereinafter, embodiments of the present invention will be described in detail with reference to the attached drawings.

Figure 1 is an exemplary diagram showing the configuration of a display device equipped with a touch panel according to the present invention, Figure 2 is an exemplary diagram showing the structure of a pixel applied to a display device equipped with a touch panel according to the present invention, and Figure 3 is an exemplary diagram showing the structure of a control unit applied to a display device equipped with a touch panel according to the present invention, and Figure 4 is an exemplary diagram showing the structure of a touch driver applied to a display device equipped with a touch panel according to the present invention. .

A display device equipped with a touch panel according to the present invention (hereinafter simply referred to as a display device) can constitute various electronic devices. The electronic device may be, for example, a smartphone, tablet PC, television, monitor, etc.

As shown in FIG. 1, a display device according to the present invention includes a display panel 100 provided with pixels for displaying images, and a touch panel 500 provided on the display panel and provided with touch electrodes 510. ), a touch driver 600 that supplies a touch signal to the touch panel 500, a power supply unit 800 that supplies a touch driving voltage (TDV) used to generate the touch signal to the touch driver, and the touch signal. A touch control unit that divides the voltage change control signal (PCS) into two signals to convert the level of the voltage from the first voltage to the second voltage, and transmits the two signals to the power supply unit 800 at different timings. (700), a gate driver 200 that supplies a gate signal to the gate lines (GL1 to GLg) provided in the display panel 100, and a data voltage to the data lines (DL1 to DLd) provided in the display panel. It includes a data driver 300 that supplies data and a control unit 400 that controls driving of the touch driver, the touch control unit, the gate driver, and the data driver.

First, the display panel 100 includes a display area where an image is output and a non-display area where an image is not output and surrounding the display area.

The display panel 100 may be a light-emitting display panel composed of light-emitting elements, a liquid crystal display panel that displays images using liquid crystals, or other various types of display panels.

When the display panel 100 is a light emitting display panel, the pixels 110 provided in the display panel 100 include a light emitting element (ED) and a switching transistor (Tsw), as shown in (a) of FIG. 2. ), a capacitor (Cst), and a driving transistor (Tdr).

The light emitting device may include any one of an organic light emitting layer, an inorganic light emitting layer, and a quantum dot light emitting layer, or may include a stacked or mixed structure of an organic light emitting layer (or inorganic light emitting layer) and a quantum dot light emitting layer.

When the display panel 100 is a liquid crystal display panel, the pixels 110 provided in the display panel 100 include a switching transistor (Tsw), a common electrode, and liquid crystal, as shown in (b) of FIG. 2. and a capacitor (Cst).

When the display panel 100 is a liquid crystal display panel, the display device may further include a backlight that outputs light to the liquid crystal display panel.

In the display panel 100, signal lines are formed that define a pixel area where the pixels 110 are formed and supply driving signals to a pixel driving circuit provided in the pixel 110.

The signal lines may include various types of lines in addition to the gate lines (GL1 to GLg) and the data lines (DL1 to DLd).

Next, the touch panel 500 includes the touch electrodes 510.

The touch electrodes 510 may be provided at positions corresponding to the display area of the touch panel 500.

Each of the touch electrodes 510 is connected to the touch driver 600 through a touch electrode line (TL). For example, when the number of touch electrodes 510 is t, t touch electrode lines TL are connected to the touch driver 600.

The touch panel 500 may be manufactured independently from the display panel 100 and then bonded to the display panel 100, or may be built into the display panel 100.

For example, when the display panel 100 is a liquid crystal display panel, the touch electrodes 510 may function as a common electrode to which a common voltage (Vcom) is supplied or a touch sensor to which a touch signal is supplied. .

Additionally, when the display panel is a light emitting display panel, the touch electrodes may be implemented by being built into the light emitting display panel. That is, by forming separate touch electrodes on the encapsulation substrate (encapsulation) of the light emitting display panel, the touch electrodes can be implemented integrally with the light emitting display panel. In addition, the cathode electrode can be divided inside the light emitting display panel and implemented as touch electrodes, or the touch electrodes can be separately arranged inside the light emitting display panel to perform a touch sensor function.

Hereinafter, a display device in which the touch electrodes 510 are built into the display panel 100 and the touch electrodes 510 perform the function of the common electrode or touch sensor will be described as an example of the present invention.

In the display device, during one frame period, a display period in which an image is displayed on the display panel 100 and a touch period in which a touch is sensed in the touch panel 500 are repeated multiple times.

In this case, during the touch period, a touch signal is supplied to each of the touch electrodes 510, and during the display period, the common voltage is supplied to each of the touch electrodes 510.

The structure and functions of the display panel 100 and the touch panel 500 are the same or similar to those of the display panel 100 and the touch panel 500 that are currently used. Therefore, detailed description thereof is omitted.

Next, as shown in FIG. 3, the control unit 400 uses the timing synchronization signal (TSS) transmitted from the external system to input image data (Ri, Gi, Bi) transmitted from the external system. A data alignment unit 430 for supplying rearranged image data to the data driver 300, and a gate control signal (GCS) and a data control signal (DCS) using the timing synchronization signal (TSS). A control signal generator 420 for generating a, receives the timing synchronization signal (TSS) and input image data (Ri, Gi, Bi) transmitted from the external system to the data alignment unit 430 and the control. An input unit 410 for transmitting to the signal generator 420, and the image data generated by the data alignment unit 430 and the control signals generated by the control signal generator 420 ( It includes an output unit 440 for outputting DCS, GCS) to the data driver 300 or the gate driver 200.

The external system performs the function of driving the control unit 400 and the electronic device. That is, when the electronic device is a smartphone, the external system performs various types of audio information, video information, and text information through a wireless communication network, and transmits the video information to the control unit 400. The video information is the input video data.

The control signal generator 420 may generate a touch control signal (TCS) to control the function of the touch controller 700.

Next, the data driver 300 may be provided on a chip-on-film attached to the display panel 100. The chip-on-film is also connected to the main board on which the control unit 400 is provided. In this case, the chip-on-film is provided with lines that electrically connect the control unit 400, the data driver 300, and the display panel 100. To this end, the lines are connected to the main substrate and the display panel 100. It is electrically connected to pads provided on the display panel 100. The main board is electrically connected to an external board on which an external system is mounted.

The data driver 300 may be directly mounted on the display panel 100 and then electrically connected to the main board.

Additionally, the data driver 300 and the control unit 400 may be formed as one integrated circuit, and the integrated circuit may be provided on the chip-on-film or directly mounted on the display panel 100.

During the display period, the data driver 300 converts the image data input from the control unit 400 into a data voltage, and converts the image data into a data voltage for each horizontal period in which the gate pulse is supplied to the gate line GL. Data voltages are supplied to the data lines. For example, the data driver 300 converts the image data into data voltages using gamma voltages supplied from a gamma voltage generator, and then converts the data voltages to the data lines during the display period. Print out. The one horizontal line refers to a virtual line formed along the gate line GL. On the first horizontal line, pixels connected to the gate line GL are arranged in a row.

Next, the gate driver 200 may be configured as an integrated circuit and then mounted in the non-display area (NAA), and may be installed in the non-display area (NAA) using a gate in panel (GIP: Gate In Panel) method. It could be. When using the gate-in-panel method, the transistors constituting the gate driver 200 are processed in the non-display area (NAA) through the same process as the transistors provided in each pixel 110 of the display area (AA). ) can be provided.

The gate driver 200 generates a gate pulse using a gate control signal transmitted from the control unit 400, for example, a start signal and gate clocks, and transmits the gate pulse to the gate lines (GL1 to GLg). ) can be supplied sequentially. The switching transistor Tsw may be turned on by the gate pulse, and accordingly, the data voltage supplied through the data line DL may be charged to the pixel.

The gate driver 200 supplies a gate-off signal to the gate lines GL1 to GLg during the remaining period when the gate pulse is not supplied. The gate off signal may turn off the switching transistor (Tsw).

The gate pulse and the gate off signal constitute a gate signal.

Next, when the touch period begins, the touch driver 600 generates a touch signal using the touch driving voltage (TDV) supplied from the power supply unit 800 and then generates a touch signal with the touch electrode 510. The touch signal is supplied, and a detection signal is received from the touch electrode 510. The touch driver 600 can analyze the detection signal and determine whether or not the touch panel 500 is touched or the touch location.

To this end, the touch driver 600 includes a touch signal generator 620 that generates the touch signals using the touch driving voltage (TDV) received from the power supply unit 800, as shown in FIG. 4. , a transceiver 610 that transmits the touch signals to the touch electrodes 510 and receives the detection signals from the touch electrodes 510, and analyzes the detection signals to determine whether or not there is a touch on the touch panel. It may include a determination unit 630 that determines at least one of the touch positions.

In this case, during the pen touch sensing period during which pen touch sensing is performed, touch signals having a first voltage (VH) may be transmitted to the touch electrodes 510, and finger touch sensing during the touch period. During this finger touch sensing period, touch signals having a second voltage (VL) may be transmitted to the touch electrodes 510. Here, the first voltage (VH) is a higher voltage than the second voltage (VL). Therefore, in the following description, the first voltage (VH) may be referred to as a high voltage, and the second voltage (VL) may be referred to as a low voltage.

In this case, the touch signal is not a voltage (DC) with one level, but is a signal that swings with a low level and a high level. Therefore, in the present invention, the touch signal may be a signal that swings with the first voltage (VH) at a high level, or a signal that swings with the second voltage (VL) at a high level.

To elaborate, in the present invention, the high level voltage of the touch signal may have two different voltages. That is, the high level voltage of the touch signal may have a first level corresponding to the first voltage or a second level corresponding to the second voltage VL. In the following description, the first level refers to the level of the first voltage (VH), and the second level refers to the level of the second voltage (VL). However, in the following description, the first level may be used with the same meaning as the first voltage (VH), and the second level may be used with the same meaning as the second voltage (VH).

The touch driver 600 may supply the common voltage to the touch electrodes 510 during the image output period.

To this end, the touch driver 600 may connect the touch electrode line (TL) connected to the touch electrode 510 with a common voltage supply unit that supplies the common voltage or a touch signal supply unit that supplies the touch signal. there is. The common voltage supply unit and the touch signal supply unit may be included in the touch driver 600, or may be configured independently from the touch driver 600.

In the above description, the data driver 300, the gate driver 200, the touch driver 600, and the control unit 400 are described as being independently configured, but the data driver 300, the gate driver 200 ), at least two of the touch driver 600 and the control unit 400 may be composed of one integrated circuit.

For example, the data driver 300 and the touch driver 600 may be configured as one integrated circuit (IC), and the data driver 300 and the control unit 400 may be configured as one integrated circuit. Alternatively, the data driver 300 and the gate driver 200 may be configured as one integrated circuit, and the data driver 300, the touch driver 600, and the control unit 400 may be configured as one integrated circuit. It may be composed of an integrated circuit.

Next, the touch control unit 700 generates a voltage change control signal (PCS) that converts the level of the touch signal from the first voltage (VH), that is, a high voltage, to the second voltage (VL), that is, a low voltage. It is divided into two signals, and the two signals can be transmitted to the power supply unit 800 at different timings.

In addition, the touch control unit 700 generates a touch synchronization signal (Tsync) for controlling the operation timing of the touch driver 600 and the power supply unit 800 and the level of the touch signal at the first voltage (VH). It is also possible to generate a voltage change control signal (PCS) that converts to the second voltage (VL).

However, the touch synchronization signal (Tsync) may be generated in the control unit 400 and supplied to the touch control unit 700, the touch driver 600, and the power supply unit 800.

Lastly, the power supply unit 800 performs the function of supplying the touch driving voltage (TDV) used to generate the touch signal to the touch driver 600.

In particular, the power supply unit 800 may generate a touch driving voltage (TDV) corresponding to the voltage change control signal (PCS) and transmit it to the touch driver 600.

Additionally, the power supply unit 800 includes a storage unit for storing the voltage change control signal (PCS).

Hereinafter, the driving method of the present invention will be described with reference to FIGS. 1 to 8.

Figure 5 is an exemplary diagram showing how the touch period and display period are repeated in the display device according to the present invention.

As described above, in the present invention, the display period (D) and the touch period (T) may be repeated multiple times during one frame period.

Here, one frame period refers to the period during which one image is output. In other words, one frame period refers to the concept of time. Additionally, in FIG. 5, the 1st frame and the 2nd frame refer to the order of 1 frame periods. That is, the second frame starts after the first frame, and each of the first frame and the second frame lasts for one frame period.

The first frame and the second frame can be distinguished as shown in FIG. 2 by a vertical synchronization signal (Vsync) transmitted from the external system or generated by the control unit 400.

The display period (D) and the touch period (T) may be repeated multiple times in one frame period, as shown in FIG. 5. In FIG. 5, reference numeral TD may be a signal that distinguishes the display period (D) and the touch period (T).

In the touch period (T), the touch driver 600 can perform at least one of finger touch sensing (Finger), which senses a touch by a finger, and pen touch sensing (Pen), which senses a touch by a pen. there is.

In the touch period (T), when both the pen touch sensing (Pen) and the finger touch sensing (Finger) are performed, the touch driver 600, as shown in FIG. 6, performs the pen touch sensing ( Pen) can be performed first, and then the finger touch sensing (Finger) can be performed.

Hereinafter, as shown in FIG. 5, a first touch period in which only the pen touch sensing (Pen) is performed and a second touch period in which the pen touch sensing (Pen) and the finger touch sensing (Finger) are performed are repetitive. A display device performed as an example is described as an example of the present invention.

Figure 6 is an example diagram showing how pen touch sensing and finger touch sensing are performed in the display device according to the present invention, and Figure 7 shows transmission from the touch control unit to the power supply unit during the pen touch sensing and finger touch sensing shown in Figure 6. This is an example diagram showing the signals. In particular, in FIG. 7, (a) is an example diagram for explaining pen touch information (PTI), and (b) shows the pen touch information (PTI), voltage change control signal (PCS), and first waiting period (P1). And this is an example diagram for explaining the second waiting period (P2).

As described above, in the present invention, a first touch period (TP1) in which only the pen touch sensing (Pen) is performed and a second touch in which the pen touch sensing (Pen) and the finger touch sensing (Finger) are performed. The period TP2 may be performed repeatedly.

When the first touch period (TP1) in which only the pen touch sensing (Pen) is performed begins, the touch control unit 700 operates the Pen touch information (PTI) for pen touch sensing (Pen) is supplied to the power supply unit 800.

The power supply unit 800 transmits the touch driving voltage (TDV) corresponding to the pen touch information (PTI), that is, the first voltage (VH), to the touch driver 600.

The touch driver 600 supplies touch signals TS using the first voltage VH to the touch electrodes 510 during a period Y1 during which the touch synchronization signal Tsync is maintained at a low level. do.

Here, the pen touch information (PTI) may include an address where the first voltage (VH) will be stored among the storage units provided in the power supply unit 800 and information about the first voltage (VH). . That is, as shown in FIG. 7, the pen touch information (PTI) is connected to the first data (PT1), which includes information about the address where the first voltage (VH) will be stored, and the first voltage (VH). It may include second data (PT2) containing information about and third to fifth data (PT3 to PT5) containing other information. The order in which the information is arranged can be changed in various ways.

The size of the pen touch information (PTI) is larger than the size of the voltage control change signal (PCS), which will be explained below, and therefore, the pen touch information (PTI) is transmitted from the touch control unit 700 to the power supply unit 800. It is longer than the transmission period.

When the touch period (TP2) in which both the pen touch sensing (Pen) and the finger touch sensing (Finger) are performed begins, the touch control unit 700 performs a period in which the touch synchronization signal (Tsync) maintains a high level. During (X1), first, the pen touch information (PTI) for the pen touch sensing (Pen) is supplied to the power supply unit 800, and after the pen touch information (PTI) is transmitted, the touch signal (TS) ) is transmitted to the power supply unit 800 to convert the level of the voltage change control signal (PCS) from the first voltage (VH) to the second voltage (VL).

As shown in FIGS. 6 and 7, the voltage change control signal (PCS) is divided into two signals (SG1 and SG2), and the touch control unit 700 controls the two signals at different timings. It is transmitted to the power supply unit 800.

That is, the touch control unit 700 preferentially supplies the first signal (SG1) of the two signals (SG1, SG2) to the power supply unit 800 immediately after the pen touch information (PTI) is transmitted. , When pen touch sensing (Pen) is performed based on the pen touch information (PTI), the second signal (SG2) of the two signals is supplied to the power supply unit 800.

Here, the first signal (SG1) of the two signals is an address signal, and the second signal (SG2) of the two signals is a level signal containing information about the level of the touch signal, The address signal may include address information where the level signal will be stored.

To elaborate, the first signal (SG1) is an address signal in which the second voltage (VL) will be stored in the storage unit provided in the storage unit of the power supply unit 800, and the second signal ( SG2) is a level signal containing information about the level of the touch signal, that is, the second voltage (VL).

As described above, in the present invention, the first signal SG1 is transmitted to the power supply unit 800, and a preset period (e.g., a first waiting period and a second waiting period to be described below) is transmitted to the power supply unit 800. ) has elapsed, the second signal (SG2) is transmitted to the power supply unit 800.

That is, immediately after the pen touch information (PTI) requesting to generate the level of the touch signal as the first voltage (VH) is transmitted to the power supply unit 800, the first signal (SG1) is transmitted to the power supply unit. is transmitted.

Here, the reason why the first waiting period (P1) is required is that the communication protocol (for example, I2C) between the touch control unit 700 and the power supply unit 800 is used in the first waiting period (P1). This is because if it is not maintained in the low state and remains in the high state, communication by the above protocol may be interrupted. That is, when information or a signal is transmitted from the touch control unit 700 to the power supply unit 800 during the first waiting period (P1), the protocol can be converted to the high state, and the first signal (SG1) ) must be transmitted to the power supply unit 800 before the first waiting period (P1). Accordingly, no information or signal is transmitted from the touch control unit 700 to the power supply unit 800 during the first waiting period (P1).

First, the power supply unit 800 transmits the touch driving voltage (TDV) corresponding to the pen touch information (PTI), that is, the first voltage (VH), to the touch driver 600.

Accordingly, when the period (Y2) in which the touch synchronization signal (Tsync) is maintained at a low level begins, the touch driver 600 first sends the touch signal (TS) using the first voltage (VH) to the touch electrode. (510) supplied.

Accordingly, the pen touch sensing (Pen) can be performed.

As described above, when pen touch sensing (Pen) is performed based on the pen touch information (PTI), the second signal (SG2) of the two signals is supplied to the power supply unit 800. .

That is, the touch control unit 700 generates the touch synchronization signal (Tsync). As shown in FIGS. 6 and 7, the pen touch information (PTI) is transmitted to the power supply unit 800 when the touch synchronization signal (Tsync) is converted from low to high (X2). The first signal (SG1) is transmitted to the power supply unit 800 before the touch synchronization signal is converted from high to low, and the pen touch sensing (Pen) converts the touch synchronization signal (Tsync) from high to low. It can be performed after conversion.

In this case, as described above, after the first signal (SG1) is transmitted to the power supply unit 800, the first waiting period occurs until the touch synchronization signal (Tsync) is converted from high to low. (P1) is required.

The pen touch sensing (Pen) is performed after the touch synchronization signal (Tsync) is converted from high to low and a second waiting period (P2) has elapsed, and the second signal (SG2) is performed by the pen touch sensing ( When Pen) is performed, it is transmitted to the power supply unit 800. Here, the second waiting period P2 may be a delay time taking into account the polling time of the touch synchronization signal Tsync.

When the second signal (SG2) is received during the pen touch sensing (Pen), the power supply unit 800 responds to the second signal (SG2) according to the timing when the finger touch sensing (Finger) starts. The touch driving voltage (TDV), that is, the second voltage (VL), is transmitted to the touch driver 600.

When the pen touch sensing (Pen) is terminated, the touch driver 600 generates touch signals (TS) using the second voltage (VL) instead of the first voltage (VH), and the generated touch signal (TS) are supplied to the touch electrodes 510.

Accordingly, the finger touch sensing (Finger) can be performed. In particular, since the second voltage (VL) can be supplied from the power supply unit 800 in accordance with the timing at which finger touch sensing (Finger) starts, the finger touch sensing (Finger) It can be performed normally by .

In particular, because the period during which the second signal (SG) is transmitted to the power supply unit 800 is shorter than or equal to the period during which the pen touch sensing (Pen) is performed, the second voltage (VL) is applied to the finger touch It can be transmitted to the touch driver 600 in accordance with the timing at which sensing (finger) is performed.

Below, the features of the present invention described with reference to FIGS. 5 to 8 are summarized.

Figure 8 is an example diagram for explaining the duration and output timing of signals generated in the display device according to the present invention. In particular, FIG. 8 shows the period (X2) in which the touch synchronization signal (Tsync) is converted from low to high and the period ( This is an example diagram showing the period (Y2).

In the present invention, a first touch period (TP1) in which pen touch sensing (Pen) is performed and a second touch period (TP2) in which pen touch sensing (Pen) and finger touch sensing (Finger) are performed are repeated.

In this case, in the first touch period (TP1), the pen touch information (PTI) is transmitted from the touch control unit 700 to the power supply unit 800, and then the pen touch is sensed by the first voltage (VH). (Pen) is performed.

In the second touch period TP1, first, the pen touch information (PTI) is transmitted from the touch control unit 700 to the power supply unit 800, and after the pen touch information (PTI) is transmitted, the pen touch information (PTI) is transmitted from the touch control unit 700 to the power supply unit 800. A voltage change control signal (PCS) that converts the level of the touch signal (TS) from the first voltage (VH) to the second voltage (VL) is supplied from the touch control unit 700 to the power supply unit 800. do.

In particular, after the pen touch information (PTI) is transmitted, an address signal in which information about the second voltage (VL) will be stored, that is, the first signal (GS) is transmitted.

After the first signal (GS) is transmitted, when the first waiting period (P1) elapses, the touch synchronization signal (Tsync) is converted from high level to low level, and accordingly, the pen touch sensing (Pen) ) is performed.

In this case, the first waiting period (P1) refers to the period from when the first signal (SG) is transmitted until the touch synchronization signal (Tsync) is converted to a low level.

When the second waiting period (P2) elapses after the touch synchronization signal (Tsync) is converted from high level to low level, the pen touch sensing (Pen) is performed. The second waiting period P2 may be a delay time taking into account the polling time of the touch synchronization signal Tsync.

Before the pen touch sensing (Pen) is performed, the power supply unit 800 transmits the first voltage (VH) to the touch driver 600 according to the pen touch information (PTI). When the pen touch sensing (Pen) starts, the touch driver 600 transmits touch signals (TS) having the first voltage (VH) to the touch electrodes 510, and the touch electrodes 510 It is possible to determine whether or not the touch panel 500 is touched or where it is touched using detection signals received from the touch panel 500.

While the pen touch sensing (Pen) is performed, the second signal (SG2), that is, a level signal containing information about the second voltage (VL), is transmitted from the touch control unit 700 to the power supply unit 800. ) is transmitted.

Here, the period during which the second signal SG2 is transmitted may be approximately 27 ㎲, as shown in FIG. 8, and the period during which the pen touch sensing (Pen) is performed may be approximately 40 ㎲. It can be. Accordingly, while the pen touch sensing (Pen) is performed, the second signal SG2 may be transmitted from the touch control unit 700 to the power supply unit 800.

Here, the period during which the first signal SG1 is transmitted may be approximately 54 μs. The first waiting period (P1) is shorter than the period during which the first signal (SG1) and the second signal (SG2) are transmitted.

Accordingly, if the first signal (SG1) and the second signal (SG2) are transmitted continuously immediately after the pen touch information (PTI) is transmitted, there is no first waiting period (P1), or, While the first signal SG1 and the second signal SG2 are being transmitted, the touch synchronization signal Tsync may change from a high level to a low level.

In this case, as described above, since communication by the protocol may be interrupted, the first signal (SG1) and the second signal (SG2) cannot be transmitted normally, and therefore, the pen touch sensing (Pen) may not function properly.

In addition, if the first signal (SG1) and the second signal (SG2) are transmitted continuously when the touch synchronization signal (Tsync) changes from high level to low level, the finger touch sensing (Finger) is started. Even after this, because the first voltage VH is supplied to the touch driver 600, the finger touch cannot be performed normally.

That is, since the transmission period of the first signal (SG1) and the second signal (SG2) is approximately 81 μs, it is longer than the 40 μs during which the pen touch sensing (Pen) is performed. Therefore, even if finger touch sensing (Finger) starts after pen touch sensing (Pen), the first voltage (VH) is continuously transmitted to the touch driver 600. Accordingly, touch signals TS having the first voltage VH are supplied to the touch electrodes 510 from the finger touch sensing (Finger). Therefore, the finger touch sensing (Finger) cannot be performed normally.

To explain further, in the case of pen touch sensing (Pen), a touch signal (TS) having a high voltage, that is, the first voltage (VH), must be supplied to the touch panel 500 to effectively perform sensing, and the finger During touch sensing (finger), a low voltage lower than the high voltage, that is, the second voltage (VL), must be supplied to the touch panel 500 to effectively perform sensing.

However, if the first signal (SG1) and the second signal (SG2) are transmitted continuously when the touch synchronization signal (Tsync) changes from high level to low level, the finger touch sensing (Finger) starts. Even after this, because the first voltage VH is supplied to the touch driver 600, the finger touch cannot be performed normally.

Therefore, in the present invention, as described above, the first signal (SG1) is transmitted immediately after the pen touch information (PTI) is transmitted, and thus, the first waiting period can be sufficiently secured. . In addition, since the period during which the second signal SG1 is transmitted is shorter than the period during which the pen touch sensing (Pen) is performed, the second signal SG2 is sufficiently transmitted while the pen touch sensing (Pen) is performed. can be transmitted.

Therefore, after the pen touch sensing (Pen) and before the finger touch sensing (Finger) starts, the power supply unit 800 may transmit the second voltage (VL) to the touch driver 600, and the touch When the finger touch sensing (Finger) starts, the driver 600 may transmit touch signals TS having the second voltage VL to the touch electrodes 510.

Accordingly, the finger touch sensing (Finger) can also be performed normally.

Those skilled in the art to which the present invention pertains will understand that the present invention can be implemented in other specific forms without changing its technical idea or essential features. Therefore, the embodiments described above should be understood in all respects as illustrative and not restrictive. The scope of the present invention is indicated by the claims described below rather than the detailed description above, and all changes or modified forms derived from the meaning and scope of the claims and their equivalent concepts should be interpreted as being included in the scope of the present invention. do.

100: display panel 200: gate driver
300: data driver 400: control unit
500: Touch panel 600: Touch driver
700: touch control unit 800: power supply unit

Claims (11)

A display panel provided with pixels for displaying images;
A touch panel provided on the display panel and equipped with touch electrodes;
a touch driver that supplies touch signals to the touch panel;
a power supply unit that supplies a touch driving voltage used to generate the touch signal to the touch driver; and
A voltage change control signal that converts the high level voltage of the touch signal from the first level of the first voltage to the second level of the second voltage is divided into two signals, and the two signals are divided into two signals at different timings. It includes a touch control unit that transmits to the power supply unit,
The first level is a higher voltage than the second level,
A display device equipped with a touch panel wherein the power supply unit transmits a touch driving voltage corresponding to the voltage change control signal to the touch driver. According to claim 1,
The first of the two signals is an address signal,
Of the two signals, the second signal is a level signal containing information about the second level,
A display device equipped with a touch panel wherein the address signal includes address information where the level signal is to be stored. According to claim 2,
A display device equipped with a touch panel in which the first signal is transmitted to the power supply unit and, after a preset period of time, the second signal is transmitted to the power supply unit. According to claim 3,
A display device equipped with a touch panel in which the first signal is transmitted to the power supply unit immediately after pen touch information for generating the level of the touch signal to the first level is transmitted to the power supply unit. According to claim 1,
During one frame period, a display period in which an image is displayed on the display panel and a touch period in which a touch is sensed on the touch panel are repeated multiple times,
During the touch period, the touch driver performs at least one of finger touch sensing for sensing a touch with a finger and pen touch sensing for sensing a touch with a pen,
In the touch period, when both pen touch sensing and finger touch sensing are performed, the touch driver performs the pen touch sensing first and then performs the finger touch sensing. According to claim 5,
A display device equipped with a touch panel in which a first touch period in which only the pen touch sensing is performed and a second touch period in which the pen touch sensing and the finger touch sensing are repeatedly performed. According to claim 5,
When the second touch period in which both the pen touch sensing and the finger touch sensing begin, the touch controller,
Supplying pen touch information for pen touch sensing to the power supply unit,
After the pen touch information is transmitted, a first signal of the two signals is supplied to the power supply unit,
A display device equipped with a touch panel that supplies a second signal of the two signals to the power supply unit when pen touch sensing based on the pen touch information is performed. According to claim 7,
The touch control unit generates a touch synchronization signal,
The pen touch information is transmitted to the power supply unit when the touch synchronization signal is converted from low to high,
The first signal is transmitted to the power supply before the touch synchronization signal is converted from high to low,
A display device equipped with a touch panel in which the pen touch sensing is performed after the touch synchronization signal is converted from high to low. According to claim 8,
A display device equipped with a touch panel that requires a first waiting period until the touch synchronization signal is converted from high to low after the first signal is transmitted to the power supply unit. According to clause 9,
The pen touch sensing is performed after the touch synchronization signal is converted from high to low and a second waiting period has elapsed,
The second signal is transmitted to the power supply unit when the pen touch sensing is performed. According to claim 7,
The period during which the second signal is transmitted to the power supply unit is shorter than or equal to the period during which the pen touch sensing is performed.