KR20160031135A - Display device with touch panel - Google Patents

Abstract

The present invention relates to a display device comprising a touch panel. Especially, the present invention is to provide the display device comprising a touch panel to determine whether a touch is applied, in a finger mode by supplying touch operation voltage to the touch panel and receiving a sensing signal, and in a pen mode by receiving a pen signal through the touch panel. The display device comprises: an operation electrode formed on the touch panel; a receiving electrode transmitting an induced pen signal; and a touch sensing unit determining a touch coordinate.

Description

DISPLAY DEVICE WITH TOUCH PANEL [0002]

The present invention relates to a display device, and more particularly to a display device provided with a touch panel.

2. Description of the Related Art Flat panel displays (hereinafter simply referred to as "display devices") are used in various types of electronic products including mobile phones, tablet PCs, and notebook computers. Examples of flat panel display devices include a liquid crystal display (LCD), a plasma display panel (PDP), and an organic light emitting display (OLED) (EPD: ELECTROPHORETIC DISPLAY) are also widely used.

The touch panel is a kind of input device that is installed in a display device and allows the user to directly touch the screen with a finger or a pen while viewing the display device to input information.

1 is a diagram illustrating an example of a touch sensing method using a conventional active pen.

As a method of sensing a touch, there is a method of sensing a touch using a change in capacitance. When a human body or a conductive material contacts a touch panel, the capacitance type senses a change in capacitance to determine the presence or absence of a touch, and then determines the touch coordinates.

The electrostatic capacity method can also be applied to a method of determining the presence or absence of a touch by the pen. For example, in the case where a conductive material exists in the pen, the presence or absence of touch can be determined by using a change in capacitance between the pen and the touch panel.

When an active pen that outputs a pen voltage is used so that the touch sensing portion can sense the pen as described in U.S. Patent Publication No. 2013-0106720 and the like, a touch panel using an electrostatic capacitive method is used, The presence or absence of the touch can be determined by the active pen.

For example, as shown in FIG. 1, when a touch driving voltage is sequentially supplied to a driving electrode Tx of a touch panel using a capacitive method, when the active pen 10 approaches or touches the touch panel, , The sensing portion inside the active pen senses the touch driving voltage. In this case, the driving unit mounted inside the active pen may output a reversed pen voltage by inverting the touch driving voltage, or may output a pen voltage that is changed in phase by changing the touch driving voltage, To output the pen voltage whose level has been changed or to change the frequency of the touch driving voltage to output the pen voltage whose frequency has been changed.

The pen voltage is input to the touch sensing unit through the reception electrode Rx formed on the touch panel.

The touch sensing unit determines the X-axis coordinate of the touch panel by recognizing the pen voltage.

The touch sensing unit recognizes the Y-axis coordinate of the touch panel by recognizing the driving electrode Tx supplied with the touch driving voltage when the pen voltage is received.

When the touch sensing unit determines the X-axis coordinate of the touch panel using the pen voltage, the touch sensing unit may sense the touch voltage from the receiving electrode Rx by the pen voltage (A) induced by the spherical touch driving voltage as well as the induced pen signal (b).

In this case, in order for the touch sensing unit to distinguish the pen signal (b) from the sensing signal (a), the active pen must output a high voltage several times larger than the touch driving voltage. As a result, the structure of the internal circuit of the active pen becomes complicated, the volume of the active pen becomes large, and the power consumption of the active pen becomes high.

In addition, when the pen signal (b) and the sensing signal (a) are mixed with noise or other various environment changes, the touch sensing unit can not accurately distinguish the pen signal (b) and the sensing signal May also occur.

For example, since the pen signal (b) and the sensing signal (a) are received together through the receiving electrode, any one of them may function as a noise component, (b) or the detection signal (a). Therefore, in the display device provided with the conventional touch panel, it is difficult to completely distinguish the presence or absence of touch by the active pen or the finger.

The present invention solves the above-mentioned problems. In the finger mode, a touch driving voltage is supplied to a touch panel, and then a touch signal is received to determine whether a touch is present. In the pen mode, a pen signal received from the touch panel is received And a display device provided with a touch panel for judging presence or absence of a touch.

According to an aspect of the present invention, there is provided a display device including a touch panel, the touch panel including a touch panel, a finger drive mode, and a pen voltage supplied from the active pen. A driving electrode; A receiving electrode formed on the touch panel and transmitting a sensing signal induced by the touch driving voltage in the finger mode and transmitting a pen signal induced by the pen voltage in the pen mode; And a controller for supplying the touch driving voltage to the driving electrode in the finger mode and receiving the sensing signal from the receiving electrode to determine the presence or absence of a touch on the touch panel and touch coordinates, And a touch sensing unit for receiving the pen signals through the receiving electrode to determine touch coordinates on the touch panel.

According to the present invention, only the presence or absence of touch by the finger is determined in the finger mode, and only the presence or absence of touch by the active pen is determined in the pen mode. Therefore, the touch sensitivity can be improved.

1 is a diagram illustrating an example of a touch sensing method using a conventional active pen.
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a touch panel.
3 is a diagram illustrating a configuration of a touch sensing unit applied to a display device having a touch panel according to the present invention.
4 is a diagram for explaining a method of driving a touch panel and a touch sensing unit applied to a display device having a touch panel according to the present invention.

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

2 is a diagram illustrating an example of a display device having a touch panel according to the present invention.

2. Description of the Related Art Generally, when a human body or a conductive material touches a touch sensor, a display device using a capacitive sensing method senses a change in capacitance, determines whether or not a touch is present, and determines precise touched coordinates. In the display device using the electrostatic capacity method, even if the active pen is applied, the presence or absence of touch by the finger and the actif pen is judged by simply changing the driving method without a separate additional layer as mentioned in the background art .

Particularly, in the display device provided with the touch panel according to the present invention, in the finger mode in which the presence or absence of touch by the finger is judged, it is judged whether or not the touch is caused by the finger and the touch coordinates, and it is judged whether or not there is a touch by the active pen do. If it is determined that there is a touch by the active pen, the finger mode is converted to the pen mode. In the pen mode, the display device provided with the touch panel according to the present invention does not supply the touch driving voltage to the driving electrode, and uses only the pen signals received through the driving electrode and the receiving electrode, Determine the coordinates.

As shown in FIG. 2, the display device having the touch panel according to the present invention performing the functions described above is formed to be perpendicular to the first axis of the touch panel 500 in the touch panel 500 (Not shown) to which a pen voltage supplied from the active pen is supplied, and a driving electrode (not shown) to which the pen voltage supplied from the active pen is supplied, A receiving electrode (not shown) that transmits a sensing signal induced by the touch driving voltage in the finger mode and transmits a sensing signal induced by the pen voltage in the pen mode, The touch panel 500 supplies the touch driving voltage to the driving electrode and receives the sensing signal from the receiving electrode to determine the presence or absence of the touch and touch coordinates on the touch panel 500, A touch sensing unit 600 for receiving the sensing signals through the driving electrode and the receiving electrode to determine touch coordinates on the touch panel 500, a panel 100 for displaying an image, A controller 400 for generating control signals for displaying an image on the panel 100 and control signals for controlling the touch sensing unit 600 according to the control of the controller 400, A gate driver 200 for sequentially supplying scan pulses to the lines GL1 to GLg and a control circuit 400 for controlling the data voltages DL1 to DLd formed on the panel 100 according to the control of the controller 400. [ And a data driver 300 for supplying the data driver 300 with data.

First, the panel 100 may be various types of panels such as a liquid crystal panel, an organic light emitting panel, or an electrophoretic display panel.

The panel 100 is formed by attaching a first substrate and a second substrate together. An intermediate layer is formed between the first substrate and the second substrate.

The first substrate and the second substrate may be made of glass, plastic, metal, or the like.

The intermediate layer may include different structures depending on the type of the display device according to the present invention. For example, when the display device according to the present invention is a liquid crystal display device (LCD), the intermediate layer may include a liquid crystal. When the display device according to the present invention is an OLED (Organic Light Emitting Display Device), the intermediate layer may include an organic compound for outputting light. When the display device according to the present invention is an electrophoretic display device (EPD), the intermediate layer may include an electrophoretic dispersion liquid or the like.

Hereinafter, for convenience of explanation, a liquid crystal display device will be described as an example of the present invention, but the present invention is not limited thereto. That is, the present invention can be applied to various kinds of display devices to which various touch panels are applied.

When the panel 100 is a liquid crystal panel, the first substrate (TFT substrate) of the panel 100 includes a plurality of data lines DL1 to DLd, a plurality of gate lines GL1 to GLg, thin film transistors (TFTs) formed in pixels formed at intersections of the data lines and the gate lines, data lines Pixel electrodes for charging a voltage and common electrodes for driving the liquid crystals filled in the pixel together with the pixel electrodes are formed.

That is, the pixels are arranged in a matrix for each region where the data lines DL1 to DLd intersect with the gate lines GL1 to GLg, and each of the pixels includes the TFT, the pixel electrode, A common electrode is formed.

A black matrix BM, a color filter, and the like are formed on a second substrate (CF substrate) of the panel 100.

The controller 400 receives a timing signal such as a data enable signal DE and a dot clock signal CLK from an external system (not shown) and controls the data driver 300 and the gate driver (GCS, DCS) for controlling the operation timing of the switches (GCS, DCS).

The gate control signals GCS generated in the controller 400 include a gate start pulse GSP, a gate shift clock GSC and a gate output enable signal GOE.

The data control signals DCS generated by the controller 400 include a source start pulse SSP, a source shift clock signal SSC, a source output enable signal SOE, a polarity control signal POL, do.

In addition, the controller 400 rearranges the input image data input from the external system and outputs the rearranged image data to the data driver 300.

The control unit 400 may generate a control signal for controlling the operation timing of the touch sensing unit 600 and transmit the control signal to the touch sensing unit 600.

In order to perform the functions as described above, the controller 400 may include a receiver for receiving the input image data, the timing signals, and various other signals from the external system, An image data processing unit for rearranging the data according to the liquid crystal panel 100 to generate reordering digital image data and a control unit for controlling the gate driver 200 and the data driver 300 using signals received from the receiving unit And a control signal generator for generating the gate control signal GCS and the data control signal DCS. The control signal generator may generate a control signal for controlling the touch sensing unit 600.

Third, the data driver 300 converts the image data input from the controller 400 into the data voltage, and supplies a data voltage corresponding to one horizontal line in each horizontal period in which a scan pulse is supplied to the gate line, Data lines. That is, the data driver 300 converts the image data into data voltages using gamma voltages supplied from a gamma voltage generator (not shown), and outputs the data voltages to the data lines.

The data driver 300 generates a sampling signal by shifting a Source Start Pulse (SSP) transmitted from the controller 400 according to a Source Shift Clock (SSC). The data driver 300 latches the image data RGB input according to the source shift clock SSC according to the sampling signal and changes the data voltage to the data voltage, And supplies the data voltages to the data lines in units of horizontal lines in response to an Output Enable (SOE) signal.

For this, the data driver 300 may include a shift register unit, a latch unit, a digital-analog converter, and an output buffer.

Fourth, the gate driver 200 shifts a gate start pulse (GSP) transmitted from the control unit 400 according to a gate shift clock (GSC), sequentially shifts the gate lines On voltage Von to scan lines GL1 to GLg. The gate driver 200 supplies a gate off voltage Voff to the gate lines GL1 to GLn during the remaining period when the scan pulse having the gate on voltage Von is not supplied.

In the above description, the data driver 300, the gate driver 200, and the controller 400 are independently configured. However, at least one of the data driver 300 and the gate driver 200 And may be configured in the control unit 400.

Fifth, the touch panel 500 is formed on the panel 100 using a capacitive method. The touch panel may be formed on the panel 100, such as an in-cell type, an on-cell type, an ed-on type, or a hybrid in-cell type. In the in-cell type touch panel, the touch electrodes are embedded in the panel 100. The on-cell type touch panel is formed directly on the top surface of the substrate constituting the panel 100. [ The add-on type touch panel is fabricated independently of the panel 100 that outputs an image, and is then attached to the panel 100. In the hybrid in-cell type touch panel, one of the touch electrode and the reception electrode constituting the touch panel is formed on the first substrate constituting the panel 100, and the other is formed in the panel 100 And is formed on the second substrate.

The touch panel 500 may be configured in a mutual manner. The touch panel 500 using the mutual scheme includes driving electrodes sequentially supplied with a touch driving voltage and receiving electrodes for transmitting a sensing signal generated by the touch driving voltage to the touch sensing unit 600 . The driving electrodes and the receiving electrodes are formed on the touch panel 500 so as to cross each other at right angles. Hereinafter, particularly, the driving electrodes are formed perpendicular to the first axis of the touch panel 500, for example, the longitudinal axis, and the receiving electrodes are disposed on the second axis of the touch panel 500, The present invention will be described by taking as an example a touch panel formed perpendicular to the horizontal axis.

The arrangement and functions of the driving electrodes and the receiving electrodes are the same as those of driving electrodes and receiving electrodes formed on a general touch panel for determining whether or not a touch is made using a capacitive method.

The driving electrodes are connected to the touch sensing unit 600 through driving electrode lines TL1 to TLk. The receiving electrodes are connected to the touch sensing unit 600 through receiving electrode lines RL1 to RLs.

Sixth, the touch sensing unit 600 senses whether or not the touch panel 500 is touched by using sensed signals or pen signals received from the touch panel. In this case, the touch sensing unit 600 can determine whether or not there is a touch with the finger and whether or not the touch is caused by the active pen.

The active pen may output the pen voltage so that the touch sensing unit 600 can sense the pen as described in U.S. Patent Publication No. 2013-0106720.

In this case, the touch sensing unit 600 applied to the present invention sequentially supplies the touch driving voltage to the driving electrodes formed on the touch panel 500, and then receives the touch driving voltage through the receiving electrodes The touch coordinates of the first axis and the touch coordinates of the second axis can be determined using the sensing signals. When the user's finger touches the touch panel 500, the sensing signal is induced by the touch driving voltage and is transmitted to the touch sensing unit 600 through the receiving electrodes.

The touch sensing unit 600 may determine touch coordinates of the first axis and touch coordinates of the second axis of the touch panel using a pen signal that is guided to the receiving electrode. The pen signal is guided by the pen voltage output from the active pen and transmitted to the touch sensing unit 600 through the reception electrodes when the active pen touches or is adjacent to the touch panel 600 .

In particular, in the finger mode, the touch sensing unit 600 does not supply the touch driving voltage to the driving electrode every predetermined period, and when the touch driving voltage is not supplied, And if the pen signal is not received, continues the finger mode, and when the pen signal is received, switches the drive mode of the touch panel to the pen mode.

The mode for driving the touch panel 500 is divided into the finger mode and the pen mode.

In the finger mode, whether or not the user touches the touch panel 500 is determined.

In the pen mode, whether the touch panel 500 is touched by the active pen is determined.

In other words, the touch sensing unit 600 basically determines whether or not the finger of the user is touched in the finger mode, determines the touch coordinates of the finger, It is judged whether or not the touch is made. If it is determined that there is a touch by the active pen, the touch sensing unit 600 switches the finger mode to the pen mode, and then determines the touch coordinates by the active pen.

In addition, the touch sensing unit 600 switches the drive mode of the touch panel to the finger mode if the pen signal is not received for a predetermined period of time in the pen mode.

For example, in the pen mode, the touch sensing unit 600 does not supply any signal to the driving electrodes and the receiving electrodes. Therefore, even if the user touches the touch panel 500 with a finger instead of the active pen, the touch sensing unit 600 can not determine the presence or absence of the touch by the finger and the touch coordinates.

In order to prevent such an abnormal operation, the touch sensing unit 600 may be configured such that, in the pen mode, if the touch by the active pen is not sensed for a preset period of time, .

Alternatively, if the pen signal has a value that exceeds a predetermined value or has a value completely different from a predetermined value, the touch sensing unit 600 determines that there is a touch by a finger, 500 may be switched to the finger mode.

As described above, in the finger mode, the presence or absence of the touch by the active pen is determined every preset period, and thus, the transition from the finger mode to the pen mode can be performed.

The specific configuration and function of the touch sensing unit 600 will be described below in detail with reference to FIG.

3 is a diagram illustrating a configuration of a touch sensing unit applied to a display device having a touch panel according to the present invention.

As described above, the display device provided with the touch panel according to the present invention includes the touch panel 500, the touch sensing part 600, the panel 100 The control unit 400, the gate driver 200, and the data driver 300. The configuration and functions of the panel 100, the controller 400, the gate driver 200, and the data driver 300 are the same as those described above, and therefore, a description thereof will be omitted.

First, a plurality of the driving electrodes are formed perpendicular to a first axis of the touch panel 500, for example, a vertical axis. The driving electrodes are connected to the touch sensing unit 600 through the driving electrode lines TX1 to TXk. The driving electrodes are formed perpendicular to the receiving electrodes.

The touch driving voltage is supplied to the driving electrode in the finger mode, and the pen voltage supplied from the active pen is supplied in the pen mode.

Second, the plurality of receiving electrodes are formed perpendicular to the second axis of the touch panel 500, for example, the abscissa axis. The receiving electrodes are connected to the touch sensing unit 600 through the receiving electrode lines RX1 to RXs. The receiving electrodes are formed perpendicular to the driving electrodes.

The receiving electrodes transmit the sensed signal induced by the touch driving voltage to the touch sensing unit 600 in the finger mode and the pen signal induced by the pen voltage in the pen mode, 600).

Third, the touch sensing unit 600 is connected to the driving electrodes through the driving electrode lines TX1 to TXk, and is connected to the receiving electrodes through the receiving electrode lines RX1 to RXs. .

The touch sensing unit 600 supplies the touch driving voltage to the driving electrode in the finger mode and receives the sensing signal from the receiving electrode to determine whether or not the touch is made by the finger on the touch panel and touch coordinates do.

In the pen mode, the touch sensing unit 600 receives the pen signals through the driving electrode and the receiving electrode, and determines touch coordinates of the active pen in the touch panel 500.

That is, in the finger mode, the touch sensing unit 600 determines whether or not the touch is performed by the finger and touch coordinates. In the pen mode, the touch sensing unit 600 determines whether or not the touch is performed by the active pen.

In the finger mode, the touch sensing unit 600 does not supply the touch driving voltage to the driving electrode every predetermined period, and when the touch driving voltage is not supplied, Is received or not. As a result of the determination, when the pen signal is not received, the touch sensing unit 600 continues the finger mode. When the pen signal is received, the drive mode of the touch panel is switched from the finger mode to the pen mode .

That is, the touch sensing unit 600 determines whether or not there is a touch by the active pen in the finger mode. If it is determined that there is a touch by the active pen, Mode to the pen mode.

In more detail, the touch sensing unit 600 determines whether or not a finger is touched in the finger mode, and determines whether or not there is a touch by the active pen for a very short period of the finger mode.

To this end, the touch sensing unit 600 does not supply the touch driving voltage to the driving electrodes when a predetermined period of time has elapsed in the finger mode. In this case, if there is a touch by the active pen, the pen signal is inputted through the driving electrodes or the receiving electrodes. When the pen signal is input, the touch sensing unit 600 switches the driving mode of the touch panel 500 from the finger mode to the pen mode.

In addition, the touch sensing unit 600 switches the drive mode of the touch panel to the finger mode if the pen signal is not received for a predetermined period of time in the pen mode.

As described above, in the finger mode, the touch sensing unit 600 determines whether or not the finger is touched, the touch coordinates by the finger, and whether the touch is performed by the active pen.

In the pen mode, the touch sensing unit 600 determines presence or absence of touch by the active pen and touch coordinates.

Therefore, the display device provided with the touch panel according to the present invention can judge the touch coordinates by the finger and the touch coordinates by the active pen in different driving modes by using different methods. As a result, the sensitivity of judging whether or not a finger is touched can be improved and the sensitivity of judging whether or not the active pen has touched can be improved.

3, the touch sensing unit 600 according to an embodiment of the present invention includes a finger driver 610 for supplying the touch driving voltage, A first determination unit (650) for determining a touch coordinate of a first axis of the touch panel (500) using the pen signal that is received from the touch electrode A second determination unit 620 for determining touch coordinates of a second axis of the panel 500 and a second determination unit 620 for determining whether the drive mode of the touch panel 500 is the finger mode or the pen mode, And a mode switching unit 630 and 640 for connecting the first determination unit 610 to the first determination unit 650.

First, the finger drive unit 610 performs a function of generating the touch driving voltage.

Next, in the pen mode, the first determination unit 650 determines whether or not the first axis of the touch panel 500, for example, the touch of the Y axis, using the pen signal received from the driving electrodes Determine the coordinates.

For example, the first determination unit 650 knows information about the position of each of the driving electrodes, and the pen signal is received only through the driving electrodes that are in contact with or adjacent to the active pen. Accordingly, the first determination unit 650 can determine the touch coordinates of the Y-axis at the touched position of the active pen using the coordinates on the first axis of the drive electrode on which the pen signal is received.

Next, in the finger mode, the second determination unit 620 determines whether or not the second axis of the touch panel 500, for example, the touch of the X axis, using the sensing signals received from the receiving electrodes, Determine the coordinates.

The second determination unit 620 determines touch coordinates of the second axis of the touch panel 500 using the pen signal received from the receiving electrodes in the pen mode.

For example, the second determination unit 620 knows information about the position of each of the reception electrodes, and the detection signal is received only through the reception electrode on which the active pen or the finger is in contact with or adjacent to the reception electrode. Accordingly, the second determination unit 620 may use the coordinates on the second axis of the receiving electrode on which the pen signal or the sensing signal is received, to calculate the touch coordinates of the X-axis at the position where the active pen or the finger is touched It can be judged.

In order to perform the above-described functions, all the switching units 630 and 640 sequentially connect the driving electrodes to the finger driving unit 610 in the finger mode, The switching unit 640 connects the electrodes to the first determination unit 650 and the switching unit 640 according to a signal received from the first determination unit 650 or the second determination unit 620. [ And a switching control unit 630 for controlling the switching unit 630.

The switching unit 640 includes a plurality of switches 643. Each of the switches 643 connects the driving electrode to the finger driving unit 610 or the first determining unit 850 under the control of the switching control unit 630.

For example, in the finger mode, the plurality of switches 643 sequentially connect the driving electrodes to the finger driving unit 610 under the control of the switching control unit 630.

Accordingly, the touch driving voltages are sequentially supplied to the driving electrodes. In this case, the second determination unit 620 determines whether the touch panel 500 is touching the touch panel 500 using the touch panel 500 using the touch panel 500, The touch coordinates of the position touched by the touch point can be determined.

In the pen mode, the plurality of switches 643 connect the driving electrodes to the first determination unit 650 under the control of the switching control unit 630.

In this case, the first determination unit 650 may determine the first coordinate where the active pen touches or is adjacent to the driving electrode using the driving electrode on which the pen signal is received. The second determination unit 620 may determine the second coordinate where the active pen touches or is adjacent to the receiving electrode using the receiving electrode on which the pen signal is received.

The first determination unit 650 and the second determination unit 620 may be formed of one component.

In the finger mode, the switching controller 630 transmits a control signal to the switching unit 640 to sequentially connect the driving electrodes to the finger driving unit 610.

In the finger mode, the switching controller 630 transmits a control signal to the switching unit 640 so that the driving electrodes are connected to the first determiner 650 at predetermined intervals.

In this case, when the pen signal is received from at least one of the first determining unit 650 and the second determining unit 620, the switching control unit 630 controls the driving mode of the touch panel 500 And switches from the finger mode to the pen mode.

The switching controller 630 transmits a control signal to the switching unit 640 to connect the driving electrodes to the first determination unit 650 in the pen mode.

The switching controller 630 switches the drive mode of the touch panel 500 from the pen mode to the finger mode if the pen signal is not received for a predetermined period of time in the pen mode.

4 is a diagram illustrating a method of driving a touch panel and a touch sensing unit applied to a display device having a touch panel according to the present invention. Hereinafter, a method of driving a display device having a touch panel according to the present invention will be described with reference to FIG.

First, in the finger mode, the switching controller 630 outputs a control signal to sequentially connect the driving electrodes to the finger driving unit 610, as shown in FIG. 4A, 640).

According to the control signal, the switching unit 640 sequentially connects the driving electrodes to the finger driving unit 610.

When the driving electrodes are sequentially connected to the finger driving unit 610, the second determination unit 620 determines whether or not the finger touches the touch panel 500 using the sensing signals received from the receiving electrodes. Thereby determining the touch coordinates.

Next, the switching controller 630 transmits a control signal to the switching unit 640 to connect the driving electrodes to the first determiner 650 at predetermined intervals in the finger mode.

In this case, when the pen signal is received from at least one of the first determining unit 650 and the second determining unit 620, the switching control unit 630 controls the driving mode of the touch panel 500 And switches from the finger mode to the pen mode.

For example, when the driving electrodes TX are connected to the first determination unit 650, the touch driving voltage is not supplied to the driving electrodes TX.

In this case, if the pen signal based on the pen voltage is induced in the receiving electrode RX, the receiving electrode transmits the pen signal to the touch sensing unit 600. [

For this, the receiving electrodes RX are connected to the touch sensing unit 600, particularly, the second determination unit 620, as shown in FIG. 4B.

In this case, the driving electrodes TX are connected to the first determination unit 650.

When the information indicating that the pen signal is received from at least one of the first determining unit 650 and the second determining unit 620 is received, the switching control unit 630 controls the driving mode of the touch panel 500 To the pen mode in the finger mode.

However, if the pen signal is not received, the switching controller 630 maintains the driving mode of the touch panel 500 in the finger mode.

In the finger mode, the touch sensing unit 600 does not determine the touch coordinates of the active pen. That is, the touch sensing unit 600 determines whether the pen signal is received through the driving electrodes or the receiving electrodes without supplying the touch driving voltage to the driving electrodes.

Thus, whether or not the pen signal is received can be made for a short time. That is, the touch sensing unit 600 can be used to determine whether the pen signal is received for a very short time in the finger mode.

To be more specific, the touch sensing unit 600 confirms only the presence or absence of the touch by the active pen in the finger mode. Accordingly, the driving electrodes need not be sequentially driven, and the touch sensing unit 600 determines whether the pen signal is received from the receiving electrodes. Therefore, the presence or absence of touch by the active pen can be judged for a very short period of time.

Next, when the drive mode is changed from the finger mode to the pen mode, the switching controller 630 outputs a control signal to the drive unit 640 so that the drive electrodes are connected to the first determination unit 650, ).

In response to the control signal, the switching unit 640 connects the driving electrodes to the first determination unit 650.

4 (c), the touch sensing unit 600 includes a plurality of touch sensing units 600, which are generated by the active pen 10 from both the driving electrodes TX and the receiving electrodes RX The pen signal can be received.

Next, in the pen mode, the first determination unit 610 determines whether or not the touch panel 500 is operated based on the pen voltage outputted from the active pen 10, The touch coordinates of the first axis in which the touch is made. In the pen mode, the second determination unit 620 determines whether the touch panel 500 touches the touch panel 500 using the pen signal derived from the receiving electrode by the pen voltage output from the active pen 10 The touch coordinates of the second axis are determined.

Next, the switching controller 630 switches the drive mode of the touch panel 500 from the pen mode to the finger mode if the pen signal is not received for a preset period of time in the pen mode.

Finally, the switching controller 630 controls the switching unit 640, the finger driver 610, the first determiner 650, and the second determiner 620 so that the processes are repeated. do.

The display device having the touch panel according to the present invention described above will be briefly summarized as follows.

In the finger mode, the touch driving voltage is sequentially supplied to the driving electrodes in the same manner as in a general display device using the capacitive method. By using the sensing signals received from the receiving electrodes, Whether or not the touch is made, and the touch coordinates.

In this case, when the touch of the active pen is sensed, the present invention uses the pen signals received from the driving electrodes and the receiving electrodes to determine whether or not the touch is made by the active pen.

That is, in the pen mode, the pen signal derived from the pen voltage output from the active pen is transmitted to the touch sensing unit 600 through the driving electrode and the receiving electrode. The touch sensing unit 600 determines touch coordinates touched by the active pen using the driving electrode and the receiving electrode on which the pen signal is received.

In the pen mode, the touch driving voltage is not supplied to the driving electrodes. Therefore, even if an abnormal touch caused by a palm or the like occurs, the judgment process is not performed. Therefore, in the pen mode, an abnormal touch by the palm or the like may be intrinsically blocked.

According to the present invention, the pen voltage output from the active pen and the pen signal and the sensing signal induced by the touch driving voltage need not be simultaneously detected. Therefore, the active pen does not need to output a pen voltage having a high voltage or inverting the touch driving voltage so that the two signals can be distinguished. Therefore, the active pen can be manufactured with a simple structure.

According to the present invention, the following effects can be expected.

First, in order to determine the presence or absence of touch by the active pen, it is not necessary to add a new layer. Therefore, the manufacturing cost of the display device can be reduced, and the volume of the display device can be reduced.

Second, the presence or absence of touch by the finger and the presence or absence of touch by the active pen can be judged by signals having the same frequency. Therefore, an optimum signal-to-noise ratio (SNR) can be realized, and thus the touch sensitivity can be improved.

Thirdly, in the pen mode, since the touch driving voltage is not supplied to the driving electrode, an abnormal touch due to a palm, a body, or the like can be intrinsically blocked.

Fourth, in the pen mode, driving by a high voltage is not required. Thus, the power consumption of the active pen can be reduced, and thus the lifetime of the active pen can be increased.

In this case, the pen voltage output by the active pen and the touch driving voltage output from the finger driver 610 may have a value less than 3V.

Fifth, the active pen does not need to output an inversion signal and does not need to perform various modulation functions. Therefore, the structure of the active pen can be simplified and lightened.

Sixth, the touch sensing unit 600 does not need to additionally perform frequency conversion in order to individually determine whether or not there is touch by the finger and the touch by the active pen, and it is not necessary to provide a plurality of judgment programs. Accordingly, the structure and design of the touch sensing unit 600 can be further simplified.

In the above description, the present invention has been described as an example in which the touch panel 500 uses a mutual method.

However, the touch panel 500 may be configured in a self-capping manner. In the touch panel 500 using the self-capping method, a plurality of touch electrodes are formed, and each of the touch electrodes is connected to the touch sensing unit 600.

In this case, in the finger mode, the touch driving voltage is supplied to each of the touch electrodes, and the presence / absence of touch and touch coordinates on the touch panel 500 using the sensing signals received from the respective touch electrodes .

In the pen mode, the touch driving voltage is not supplied to the touch electrodes. In this case, the pen signal is received only by the touch electrode of the active electrode or the touch electrode adjacent to the active electrode.

Since the touch sensing unit 600 knows the coordinates of each of the touch electrodes, the touch coordinates obtained by touching the active pen can be determined by recognizing the touch electrode on which the pen signal is received.

It will be understood by those skilled in the art that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. The scope of the present invention is defined by the appended claims rather than the detailed description and all changes or modifications derived from the meaning and scope of the claims and their equivalents are to be construed as being included within the scope of the present invention do.

100: panel 200: gate driver
300: data driver 400:
500: touch panel 600: touch sensing part

Claims (6)

A driving electrode formed on the touch panel, the touch electrode being supplied with the touch voltage in the finger mode, and the pen voltage supplied from the active pen in the pen mode;
A receiving electrode formed on the touch panel and transmitting a sensing signal induced by the touch driving voltage in the finger mode and transmitting a pen signal induced by the pen voltage in the pen mode; And
Wherein the touch mode includes a touch mode in which the touch driving voltage is supplied to the driving electrode in the finger mode and the sensing signal is received from the receiving electrode to determine touch presence or touch coordinates in the touch panel, And a touch sensing unit for receiving the pen signals through an electrode to determine touch coordinates on the touch panel. The method according to claim 1,
The touch sensing unit includes:
A finger driver for supplying the touch driving voltage;
A first determination unit for determining touch coordinates of a first axis of the touch panel using the pen signal received from the driving electrode;
A second determination unit for determining touch coordinates of a second axis of the touch panel using the pen signal or the sensing signal received from the receiving electrode; And
And a mode switching unit for connecting the driving electrodes to the finger driving unit or the first determination unit according to whether the driving mode of the touch panel is the finger mode or the pen mode. 3. The method of claim 2,
The mode switching unit,
A switching unit that sequentially connects the driving electrodes to the finger driving unit in the finger mode and connects the driving electrodes to the first determination unit in the pen mode; And
And a switching control unit for controlling the switching unit according to a signal received by the first determination unit or the second determination unit. The method of claim 3,
Wherein the switching unit includes a plurality of switches,
Wherein each of the switches includes a touch panel that connects the driving electrode to the finger driving unit or the first determination unit under the control of the switching control unit. The method according to claim 1,
The touch sensing unit includes:
Wherein the controller determines whether or not the pen signal is received from the receiving electrode when the touch driving voltage is not supplied to the driving electrode at every predetermined interval in the finger mode, And a touch panel for continuing the finger mode if the signal is not received and switching the drive mode of the touch panel to the pen mode when the pen signal is received. The method according to claim 1,
The touch sensing unit includes:
And a touch panel for switching the drive mode of the touch panel to the finger mode if the pen signal is not received in the pen mode for a predetermined period.

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