KR20160025443A - Touch penel and coordinate indicating system having the same - Google Patents

Abstract

Disclosed is a touch panel. The touch panel includes: a channel electrode unit including a plurality of first electrodes disposed in a first direction and a plurality of second electrodes disposed in a second direction intersecting the first direction; and a control unit applying a driving signal to the electrodes inside the channel electrode unit in a plurality of electrode units to deliver the driving signal to a resonance circuit of a stylus pen approaching the touch panel through capacitive coupling and receiving a response signal that arises in the resonance circuit of the stylus pen from each of the electrodes to determine a position of the stylus pen including the resonance circuit.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a touch panel and a coordinate measuring system including the touch panel.

The present invention relates to a touch panel and a coordinate measuring system having the same, and more particularly, to a touch panel and a coordinate measuring system capable of measuring an input position of a stylus pen.

2. Description of the Related Art In recent years, the spread of smart phones or tablet PCs has been actively promoted, and a technique for a built-in contact position measuring device is being actively developed. A smartphone or a tablet PC is mainly equipped with a touch screen, and a user can designate specific coordinates of the touch screen by using a finger or a stylus pen. The user can input specific signals to the smartphone by specifying specific coordinates of the touch screen.

The touch screen can be operated based on an electrical method, an infrared method, an ultrasonic method, and the like, and an R type resistive touch screen or a C type capacitive touch screen is an example of an electric operation method.

Conventionally, an R type touch screen capable of simultaneously recognizing a user's finger and a stylus pen has been widely used. However, in the case of the R type touch screen, there was a problem due to the reflection by the air layer between the ITO layers.

Accordingly, in recent years, C type touch screens have been widely applied. Here, the C type touch screen is a touch screen that operates in a manner that senses the difference in capacitance of the transparent electrodes caused by the contact of an object. However, the C type touch screen has a disadvantage in that it is difficult to physically distinguish between the hand and the pen, which causes an operation error due to an unintended hand touch when using the pen.

In order to overcome such disadvantages, a conventional method using only software for distinguishing a hand and a pen according to the contact area and a method using a separate position measuring device such as an electromagnetic magnetic resonance (EMR) And distinguished between hand and pen.

However, the software method can not completely solve an error due to unintended hand contact, and in the case of the EMR method, a separate position measuring device must be provided, which has a problem of mounting space, weight and cost increase.

Accordingly, it has been required to develop a technique capable of distinguishing between a hand and a pen without adding a separate position measuring device.

On the other hand, the stylus pen is required to operate in a passive manner in terms of inconvenience such as battery replacement, cost, weight, and the like, so that it is also required to improve the sensitivity of the stylus capable of securing a sufficient signal to detect the stylus pen without an internal power source .

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems and to provide a touch panel and a coordinate measuring system capable of improving signal sensitivity for positioning a stylus pen.

According to an aspect of the present invention, there is provided a touch panel including a plurality of first electrodes arranged in a first direction and a plurality of second electrodes arranged in a second direction intersecting the first direction And a drive circuit for applying driving signals to the electrodes in the channel electrode unit in units of a plurality of electrodes to apply the drive signals to the touch panel through capacitive coupling, And a control unit for receiving a response signal caused by the resonance circuit of the stylus pen from each of the plurality of electrodes to determine the position of the stylus pen including the resonance circuit.

In this case, the capacitance between the plurality of first electrodes and the plurality of second electrodes may be varied by the approach of the contact object, and the control unit may control the capacitance between the first electrode and the second electrode, The amount of capacitance change between the electrodes at the electrode intersection can be calculated and the position of the contact object can be determined based on the calculated amount of capacitance change.

In this case, the controller may determine the position of the stylus pen including the resonance circuit on the basis of the ratio between the response signal received at the first electrode and the response signal received at the second electrode.

In this case, the control unit may apply the same drive signal to all of the plurality of first electrodes.

Meanwhile, the plurality of first electrodes may be divided into a plurality of subgroups in units of a plurality of electrodes arranged continuously, and the controller may simultaneously apply the same driving signal to all the first electrodes in one subgroup .

Meanwhile, the controller may simultaneously apply a driving signal to the electrode having the largest response signal among the plurality of first electrodes and the electrode having the predetermined interval with the most largely received electrode.

Meanwhile, the control unit may simultaneously apply a driving signal to at least one first electrode and at least one second electrode.

According to another aspect of the present invention, there is provided a touch panel including a driver for applying a drive signal to at least two or more electrodes of the plurality of first electrodes, a driver for applying a drive signal to the plurality of first electrodes, The control unit may determine the position of the stylus pen including the resonance circuit on the basis of the response signal received from the receiving unit.

In this case, the receiving unit can sequentially receive the response signals of the plurality of first electrodes and the plurality of second electrodes, respectively.

Meanwhile, the control unit may control the driving unit and the receiving unit so that the same driving signal is applied to the plurality of first electrodes and the response signal to each of the first electrode and the second electrode is alternately performed.

The receiving unit includes an amplifying unit for amplifying and outputting the received response signal, an ADC unit for converting the amplified response signal into a digital signal, and a controller for extracting a preset frequency component from the response signal converted into the digital signal, And a signal processing unit.

The receiving unit may receive the response signals of the plurality of first electrodes and the plurality of second electrodes in parallel on a plurality of channel basis.

In this case, the receiving unit may simultaneously receive a response signal from at least one of the plurality of first electrodes and at least one of the plurality of second electrodes, respectively.

The receiving unit includes a parallel amplifying unit for amplifying each of the response signals received from the plurality of electrodes, an ADC for converting each of the plurality of amplified signals into a digital signal, and a plurality of response signals converted into the digital signal, And a signal processing unit for extracting a predetermined frequency component.

The receiving unit may include a differential amplifying unit for differentially amplifying and outputting a difference between the response signals of the first electrode and the second electrode.

The receiving unit includes a differential amplifying unit for differentially amplifying and outputting the difference between the response signals of the two electrodes among the plurality of first electrodes and the plurality of second electrodes and outputting the differential amplified response signal to the digital signal An ADC unit, and a signal processing unit for extracting a predetermined frequency component from the response signal converted into the digital signal.

The control unit may control the channel electrode unit such that at least one of the plurality of first electrodes and the plurality of second electrodes is grounded in a period of receiving the response signal.

The controller may control the channel electrode unit such that at least one electrode other than the electrode to which the drive signal is applied is grounded in a period in which the drive signal is applied.

The first driving signal may be applied to at least one of the first electrodes except for the first electrode to which the first driving signal is applied, A second driving signal having a phase difference of 180 degrees with the driving signal can be applied.

On the other hand, the controller divides the first sub-group, the second sub-group, and the third sub-group into the first sub-group and the second sub-group, The electrodes in the second subgroup may be grounded or floated, and a second driving signal, which is opposite in phase to the first driving signal, may be applied to the electrodes in the third subgroup.

The control unit may determine the position of the stylus pen and the position of the contact object, apply the same first driving signal to a plurality of electrodes corresponding to the position of the stylus pen, And a second driving signal having a phase difference of 180 degrees from the first driving signal may be applied to the electrode.

The controller may simultaneously apply driving signals having different phases to at least one first electrode of the plurality of first electrodes and at least one second electrode of the plurality of second electrodes.

In this case, the control unit may control the phase difference between the first driving signal applied to the first electrode and the second driving signal applied to the second electrode according to the position of the first electrode and the second electrode to which the driving signal is applied, The difference can be determined.

The touch panel may include a first driver for simultaneously applying a driving signal to at least two or more electrodes among the plurality of electrodes when the stylus pen is sensed, A first receiving unit for receiving a response signal from each of the plurality of electrodes in a section in which the driving signal is not applied when the stylus pen is sensed, And a second receiving unit that receives a response signal from the plurality of second electrodes within a period in which the signal is applied.

According to an embodiment of the present invention, there is provided a coordinate measuring system including: a touch panel that collectively applies a driving signal in units of a plurality of electrodes; and a touch panel that forms a capacitance with at least one electrode of the plurality of electrodes, Wherein the touch panel receives a response signal caused by a stylus pen approaching the touch panel from each of the plurality of electrodes to detect a position of the stylus pen .

1 is a block diagram showing a configuration of a coordinate measuring system according to an embodiment of the present invention;
FIG. 2 is a block diagram showing a specific configuration of the touch panel of FIG. 1;
FIG. 3 is a circuit diagram of the touch panel of FIG. 1,
4 is a view for explaining an operation of applying a driving signal of a channel electrode portion,
5 is a diagram showing the magnitude of the generated signal of the stylus pen according to the number of electrodes to which the drive signal is inputted,
6 is a diagram for explaining an operation of determining the position of a contact object,
Figs. 7 to 9 are diagrams for explaining an operation of determining the position of an object having a resonance circuit, Fig.
FIGS. 10 and 11 are views for explaining the connection state between the touch panel and the stylus pen,
12 is an equivalent circuit when the stylus pen is disposed between a plurality of electrodes,
FIG. 13 is a diagram showing a simplified equivalent circuit when the capacitance values are sufficiently large in the equivalent circuit of FIG. 12;
14 is a view for explaining a connection state between the touch panel, the hand and the stylus pen,
15 is a diagram for explaining a method in which a plurality of driving signals are applied in an ideal case and in a practical case,
16 is a diagram for explaining the influence of a hand-transmitted response signal,
17 is a diagram for explaining an operation of applying a drive signal when a hand is in contact,
18 is a diagram for explaining the effect of the application operation as shown in Fig. 17,
19 is a view for explaining an operation of applying a drive signal in a channel electrode portion having the shape as shown in Fig. 3,
FIG. 20 is a view for explaining the influence of delay of drive signal transmission in an electrode,
FIG. 21 is a view for explaining the effect of the applying operation as shown in FIG. 20,
22 is a diagram showing a configuration of a receiving unit according to the first embodiment,
23 is a diagram showing a configuration of a receiving unit according to the second embodiment,
FIGS. 24 and 25 are diagrams for explaining the operation of the differential amplifier of FIG. 23,
26 shows a configuration of a receiving unit according to the third embodiment,
FIG. 27 is a diagram showing a configuration of a receiving unit according to the fourth embodiment,
28 is a diagram showing a configuration of a receiving unit according to the fifth embodiment,
29 is a diagram showing a configuration of a receiving unit according to the sixth embodiment,
30 is a diagram showing a configuration of a receiving unit according to a seventh embodiment,
31 is a diagram showing a configuration of a receiver according to an eighth embodiment,
32 is a diagram showing a configuration of a receiving unit according to the ninth embodiment,
33 is a diagram showing a configuration of a receiver according to the tenth embodiment,
34 is a diagram showing a configuration of a receiving unit according to the eleventh embodiment,
35 is a diagram showing a configuration of a receiving unit according to a twelfth embodiment,
36 is a diagram showing a configuration of a receiver according to the thirteenth embodiment,
37 is a diagram for explaining the operation of the receiver according to the fourth to thirteenth embodiments,
38 is a diagram for explaining the operation of the receiver according to the fourteenth embodiment,
Figs. 39A and 39B are diagrams for explaining the operation of the connection portion when receiving a response signal, Fig.
Fig. 40 is a view showing a specific configuration of the stylus pen of Fig. 1,
41 is a circuit diagram of the stylus pen of Fig. 1,
42 is a circuit diagram of a stylus pen according to another embodiment,
FIG. 43 is a circuit diagram of a stylus pen according to another embodiment, and FIG.
44 is a flowchart illustrating a method of controlling a touch panel according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

1 is a block diagram showing a configuration of a coordinate measuring system according to an embodiment of the present invention.

Referring to FIG. 1, the coordinate measuring system 300 includes a touch panel 100 and a stylus pen 200.

The touch panel 100 can determine whether the contacted object is a contact object such as a stylus pen 200 having a resonance circuit or a hand (more specifically, a finger). Then, the touch panel 100 can determine the driving method of the driving signal and the processing method of the response signal by the position determination method corresponding to the determined object type, and perform appropriate position determination corresponding to each object. At this time, when the contact object and the stylus pen are in contact with each other at the same time, the touch panel 100 can ignore the contact of the contact object and judge only the position with respect to the stylus pen.

The touch panel 100 determines the position of the object in a manner corresponding to the determined object. Specifically, if it is determined that the contacted object is a stylus pen, the touch panel 100 can determine the position of the stylus pen 200 in a manner different from a method of recognizing a contact object. Specifically, the touch panel 100 includes a plurality of electrodes. By applying a driving signal to the electrodes, the driving signal can be transmitted to the resonance circuit of the stylus pen which approaches the touch panel 100 through capacitive coupling. At this time, the touch panel 100 can simultaneously apply driving signals to a plurality of electrodes. In this case, the touch panel 100 may apply a driving signal having the same phase to a plurality of electrodes or a driving signal having a different phase for each electrode in consideration of the position of the stylus pen 200.

The touch panel 100 receives a response signal generated from the resonance circuit of the stylus pen 200 from each of the plurality of electrodes to determine the position of the stylus pen 200 including the resonance circuit. The specific configuration and operation of the touch panel 100 will be described later with reference to Fig. Here, the touch panel 100 may be a touch pad, a touch screen, a notebook equipped with a touch pad or a touch screen, a mobile phone, a smart phone, a PMP, or an MP3 player.

When it is judged that the object to be contacted is a contact object such as a hand, the touch panel 100 determines the position of the contact object by using the change in capacitance between the plurality of first electrodes and the plurality of second electrodes It can be judged. The operation of determining the position of the contact object will be described later with reference to Fig.

When it is determined that the stylus pen 200 is in contact with the stylus pen 200 at the same time, the electrode in the area where the hand is positioned is grounded or floated so that the driving signal transmitted to the stylus pen 200 is not transmitted to the hand , A drive signal having a phase different from the drive signal can be applied to the electrode in the region where the hand is located. The operation of the touch panel 100 will be described later with reference to FIGS. 10 to 19. FIG.

The stylus pen 200 forms a capacitance with at least one of a plurality of electrodes in the touch panel 100, and can receive energy for resonance through the formed capacitance.

And the stylus pen 200 can transmit a response signal caused by the resonance circuit to at least one electrode in the touch panel 100. [ The stylus pen 200 may be implemented in the form of a pen, but is not limited thereto. The specific configuration and operation of the stylus pen 200 will be described later with reference to Figs. 40 to 43. Fig.

As described above, the coordinate measuring system 300 according to the present embodiment provides the driving signal to the stylus pen 200 through the electrostatic capacitive coupling of the touch panel 100, so that the stylus pen 200 has its own power source It is possible to operate without it.

1, it is explained that the touch panel 100 determines only the position of the stylus pen 200 including the resonance circuit. However, the position of the stylus pen 200 including the resonance circuit may be determined based on a change in the capacitance of the electrode or a change in capacitance The position of the finger may be determined by detecting a signal size change or the like. This finger position determination operation will be described later with reference to Fig.

1, one stylus pen 200 is connected to the touch panel 100. However, one touch panel 100 may be connected to a plurality of stylus pens at the time of implementation, The touch panel 100 can sense the position of each of the plurality of stylus pens.

2 is a block diagram showing a specific configuration of the touch panel of Fig.

Referring to FIG. 2, the touch panel 100 may include a channel electrode unit 110 and a control unit 120.

The channel electrode unit 110 includes a plurality of electrodes. In detail, the channel electrode unit 110 may include a plurality of electrodes arranged in a matrix form. For example, the channel electrode unit 110 may include a plurality of first electrodes arranged in a first direction and a plurality of second electrodes arranged in a second direction perpendicular to the first direction. The shape and operation of a plurality of electrodes included in the channel electrode unit 110 will be described later with reference to Fig.

The control unit 120 can determine whether the contacted object is a contact object such as a hand or a stylus pen such as a pen according to a response signal received in the channel electrode unit 100. [ Specifically, immediately after the application of the driving signal is completed, when the response signal of the specific frequency is received in the section in which the drive signal is not applied, the controller 120 determines that the contacted object is caused by the stylus pen .

On the contrary, if the response signal of a specific frequency is not received immediately after the application of the drive signal is completed, the control unit 120 can determine that the object is caused by a contact object such as a hand. Judgment of such a contact object can be performed not only when the initial response signal is received, but also periodically.

For example, the control unit 120 may determine whether a user touches the stylus pen while sensing the position of the stylus pen. If the touch of the stylus pen is no longer detected, Signal can be generated. Conversely, it is possible to determine whether there is a touch (or hover) of the stylus pen while sensing the position of the user's hand, and to generate a drive signal to sense the position of the stylus pen if the position of the hand is no longer sensed.

The control unit 120 can perform position determination of the object according to the determined object type. Hereinafter, the position determining operation for the stylus pen will be described first.

First, the control unit 120 applies a driving signal to the electrodes in the channel electrode unit 110, and transmits the driving signal to the resonance circuit of the object approaching the touch panel 100 through capacitive coupling . At this time, the controller 120 may apply the same driving signal to the electrodes in the channel electrode unit 110 for each of a plurality of electrodes.

For example, the control unit 120 may apply the same drive signal to all of the plurality of electrodes in a unit of a predetermined period, apply the same drive signal to all of the plurality of electrodes arranged in the same direction, It is possible to collectively apply the same drive signal to only a few adjacent electrodes among the plurality of electrodes arranged in the direction of one direction or collectively apply the same drive signal to two mutually intersecting electrodes. Such an application method is merely an example, and may be implemented by a method other than the above-described example as long as the drive signal is simultaneously applied to two or more electrodes at the same time.

Further, in implementation, the method of applying the driving signal may be determined based on the size of the received response signal. For example, if the size of the response signal is large and the controller 120 determines that the stylus pen 200 is in contact with the touch panel 100, only the two electrodes may apply the driving signal, When it is determined that the stylus pen 200 is in the state of hovering on the touch panel 100, the six electrodes can simultaneously apply driving signals. This operation will be described later with reference to Fig.

When the controller 120 senses a touch object such as a hand other than the stylus pen 200, the control unit 120 applies the first driving signal to the electrodes expected to be located on the stylus pen 200, The second driving signal having a phase difference of 180 degrees with the first driving signal may be applied to the electrodes expected to be placed with a contact object such as a hand. Here, the first drive signal and the second drive signal are opposite in phase (i.e., have a phase difference of 180 degrees) to the drive signal having the same frequency. Such an operation will be described later with reference to Figs. 11 to 19. Fig.

Then, the control unit 120 causes the electrodes, which are expected to not be positioned at the reception timing of the response signal (that is, the region where the driving signal is not applied), to be grounded, . Such operation will be described later with reference to Figs. 39A and 39B.

The controller 120 receives a response signal generated from the resonance circuit of the stylus pen 200 from each of the plurality of electrodes to determine the position of the stylus pen. More specifically, the control unit 120 receives a response signal from each of the plurality of electrodes within a section in which no driving signal is applied, and determines the position of the stylus pen 200 based on the ratio between the response signals received from each of the plurality of electrodes It can be judged.

For example, when a plurality of electrodes are formed in a matrix shape, a plurality of first electrodes are arranged in a first direction, and a plurality of second electrodes are arranged in a second direction perpendicular to the first direction, the controller 120 May determine the position of the stylus pen 200 based on the ratio between the response signal received at the first electrodes and the response signal received at the second electrodes.

At this time, the controller 120 may perform various signal processing on the received response signal to improve the sensitivity of the response signal. Specifically, the control unit 120 amplifies each of the plurality of received response signals, performs differential amplification (or differential amplification) on the difference between the plurality of response signals, or extracts only specific frequency components, Can be improved. A specific signal processing method of the control unit 120 will be described later with reference to Figs. 22 to 36. Fig.

The control unit 120 senses the contact pressure of the stylus pen 200 based on the resonance frequency change of the received response signal or senses the operation mode of the stylus pen 200 based on the resonance frequency change of the received response signal can do. Such an operation will be described later with reference to Figs. 41 and 42. Fig.

On the other hand, if it is determined that the object is a touch object such as a hand, the controller 120 calculates the capacitance between the electrodes at a plurality of electrode intersections formed between the first electrode and the second electrode, and based on the calculated capacitance, Can be determined. This operation will be described later in detail with reference to FIG.

Specifically, the control unit 120 applies a driving signal to at least one of the plurality of first electrodes to sense a position of a contact object such as a hand not having a resonance circuit, The capacitance between each electrode can be calculated at a plurality of electrode intersections formed between the first electrode and the second electrode based on the response signal. Here, the driving signal may be a pulse signal having a binary value.

The control unit 120 applies a signal encoded with a different digital code to a plurality of first electrodes to sense a contact object such as a hand not having a resonance circuit, The capacitance between the plurality of first electrodes and the plurality of second electrodes may be calculated by applying a response signal suitable for the applied digital code.

The control unit 120 can determine the intersection where the capacitance change is greatest based on the calculated capacitance of each intersection point as the position of the contact object.

As described above, the touch panel 100 according to the present embodiment provides the driving signal to the stylus pen through the capacitive coupling, and the stylus pen 200 can operate even if there is no power source of its own. In addition, the touch panel 100 according to the present embodiment provides a driving signal to the plurality of electrodes collectively to provide a greater energy to the stylus pen 200, The response signal is generated, and the reception sensitivity can be improved. In addition, since the touch panel 100 according to the present embodiment performs various signal processing on the received response signal, it is possible to improve the reception sensitivity to the response signal.

Although only the basic configuration of the touch panel 100 has been illustrated and described above, the touch panel 100 may further include configurations other than those described above. For example, when the touch panel 100 is a touch screen, a display configuration may further be included. In the case where the touch panel 100 is a device such as a smart phone or a PMP, a display, a storage unit, .

Fig. 3 is a circuit diagram of the touch panel of Fig. 1. Fig.

Referring to FIG. 3, the touch panel 100 may include a channel electrode unit 110 and a control unit 120.

The channel electrode unit 110 includes a plurality of electrodes. 3, the channel electrode unit 110 may include a first electrode group 111 and a second electrode group 112 arranged in different directions.

The first electrode group 111 includes a plurality of first electrodes 111-1, 111-2, 111-3, 111-4, 111-5, and 111-6 arranged in a first direction (horizontal direction) can do. Here, the first electrode may be a transparent electrode and may be indium tin oxide (ITO). The plurality of first electrodes 111-1, 111-2, 111-3, 111-4, 111-5, and 111-6 in the first electrode group 111 are arranged in a predetermined (Tx signal) of the transmission signal.

The second electrode group 112 is arranged in a plurality of second electrodes 112-1, 112-2, 112-3, 112-4, 112-5, and 112-6 arranged in a second direction (longitudinal direction) . Here, the second electrode may be a transparent electrode and may be indium tin oxide (ITO). The second electrodes 112-1, 112-2, 112-3, 112-4, 112-5, and 112-6 in the second electrode group 111 may detect the positions of the fingers And may be a receiving electrode for receiving an Rx signal caused by a Tx signal input from one electrode.

On the other hand, when sensing the position of the stylus pen, the first electrode and the second electrode may be a transmitting-receiving electrode that transmits a signal in the Tx section and a signal in the receiving section in accordance with the driving section.

In the illustrated example, only six electrodes are included in each of the electrode groups, but it may be implemented as seven or more electrodes or five or fewer electrodes. In the illustrated example, the shape of the electrode in the electrode group is shown as a simple rectangular shape, but in the realization, the shape of each electrode can be realized in a more complicated form.

The control unit 120 includes a driving unit 130, a receiving unit 140, an MCU 150, and a connection unit 160.

The driving unit 130 applies a driving signal to the channel electrode unit 110 at a predetermined timing. This driving signal may be a sinusoidal waveform signal having a predetermined resonance frequency.

The receiving unit 140 receives a response signal from each electrode in the channel electrode unit 110 within a period in which no driving signal is applied. Specifically, the receiving unit 140 can sequentially receive response signals of a plurality of electrodes in units of one electrode. Alternatively, the receiving unit 140 may receive a response signal simultaneously on a plurality of electrode units. At this time, the receiver 140 may include a plurality of amplifiers to simultaneously receive a plurality of response signals. Such an example will be described later with reference to Figs. 27 to 35. Fig.

The receiving unit 140 may perform various signal processing on the received response signal. For example, the receiving unit 140 may amplify each response signal using an amplifier amp. Such an example will be described later with reference to FIG. The receiving unit 140 may perform signal processing for differential amplification in units of two response signals. Such an example will be described later with reference to FIG. The receiving unit 140 may perform signal processing for extracting only information within a predetermined frequency domain from among the received response signals. Such an example will be described later with reference to Fig.

The MCU 150 may control the driving unit 130, the receiving unit 140, and the connecting unit 160 so that the application of the driving signals and the reception of the response signals to the respective electrodes are alternately performed. For example, the MCU 150 may simultaneously output the same driving signals to the plurality of first electrodes 111-1, 111-2, 111-3, 111-4, 111-5, and 111-6 in the first time interval And controls the receiving unit 140 to receive the response signal of at least one electrode (for example, 111-1) in the second time period after the driving signal is applied. Thereafter, the MCU 150 applies the same driving signal to the plurality of first electrodes 111-1, 111-2, 111-3, 111-4, 111-5, and 111-6 again in the third time period The controller may control the driving unit 130 and may control the receiving unit 140 to receive the response signal of another electrode (for example, 111-2) in the fourth time period after the driving signal. Then, the MCU 150 can repeat the above-described processes the number of times that the response signal to the plurality of electrodes is received. In the illustrated example, the channel electrode unit 110 includes twelve electrodes, and the MCU 150 can alternately perform twelve application / reception operations. This operation will be described in detail with reference to FIG.

When a response signal to a plurality of electrodes is received, the MCU 150 transmits a response signal received from the first electrodes 111-1, 111-2, 111-3, 111-4, 111-5, The position of the stylus pen can be determined based on the ratio between the ratio of the response signals received from the second electrodes 112-1, 112-2, 112-3, 112-4, 112-5, and 112-6 .

For example, when the magnitude of the response signal of the first electrode 111-3 is larger than the magnitude of the response signal of the first electrodes 111-1, 111-2, 111-4, 111-5, and 111-6 And the magnitude of the response signal of the second electrode 112-2 is greater than the magnitude of the response signal of the second electrodes 112-1, 112-3, 112-4, 112-5, and 112-6, The position where the first electrode 111-3 and the second electrode 112-2 intersect can be determined as the position of the stylus pen 200.

On the other hand, at the time of implementation, the position of the stylus pen 200 is determined more precisely by using an interpolation method utilizing the ratio between the electrode receiving the largest response signal and the response signal received from the electrode adjacent thereto It is possible. For example, if the distance between the first electrodes is 4 mm and the position of the stylus pen 200 is determined to be the position where the first electrode and the second electrode intersect, the identification resolution is 4 mm. If the interpolation method is used An identification resolution of 0.1 mm can be realized.

The connection unit 160 may selectively connect a plurality of electrodes to the driving unit 130 or selectively connect the plurality of electrodes to the receiving unit 140. Specifically, the connection unit 160 may connect the driving unit 130 with the electrode to which the driving signal is to be applied, under the control of the MCU 150. At this time, the connection portion 160 can ground or float the electrode to which the driving signal is not applied.

Also, at least one of the plurality of first electrodes and the plurality of second electrodes may be grounded within a period in which the drive signal is not applied, that is, within a time period in which the response signal is received. This operation will be described later with reference to FIG.

Although the MCU 150 controls the connection unit 160 in the above description, the driving unit 130 controls the connection unit 160 when the drive signal is applied, and the connection unit 160 when the response signal is received. 140 may control the connection portion 160.

In the above description, the same driving signals are collectively applied to the plurality of first electrodes in the first electrode group. However, in the implementation, the same driving signals are collectively applied to the plurality of second electrodes in the second electrode group And the same driving signal may be collectively applied to the plurality of first electrodes and the plurality of second electrodes in the first and second electrode groups. In addition, a driving signal may be applied in a manner other than this method. Hereinafter, examples of application of various driving signals will be described with reference to FIGS.

3, a plurality of electrodes are arranged in a matrix form, but they may be arranged in a form other than a matrix form at the time of implementation.

3, only one driving unit and one receiving unit are shown and described. However, the present invention may be implemented with a plurality of driving units and receiving units. Such an example will be described later with reference to FIG.

4 is a view for explaining an operation of applying a driving signal of a channel electrode portion.

Referring to FIG. 4, the channel electrode unit 110 'includes a plurality of electrodes 111 and 112. 4, the channel electrode unit 110 'may include a first electrode group 111 and a second electrode group 112 arranged in different directions. At this time, the first electrode group 111 is divided into a plurality of sub-groups 111-a and 111-b in units of a plurality of electrodes arranged continuously. In the illustrated example, the first electrode group 111 may be divided into a first sub-group 111-a and a second sub-group 111-b.

The control unit 120 may determine the subgroup to which the driving signal is to be applied based on the position of the stylus pen 200 sensed in the previous process. Then, the controller 120 can collectively input the same drive signal to all the electrodes in the determined subgroup.

For example, if the position of the stylus pen 200 sensed in the previous process is a position where the first electrode 111-3 intersects with the second electrode 112-2, the controller 120 controls the first The sub group 111-a is determined as a sub group to which a driving signal is to be input and the same driving signal is simultaneously applied to the electrodes 111-1, 111-2, and 111-3 in the first sub group 111- Can be input.

At this time, the control unit 120 supplies the electrodes 111-4, 111-5, 111-6, 112-1, 112-2, 112-3, 112-4, 112-5, and 112-6 ) Can be grounded or floated.

In the above description, the subgroups are described in advance, but the subgroups can be dynamically varied at the time of implementation. For example, the control unit 120 may detect an electrode (for example, 111) and a corresponding electrode 111-3 (for example, 111 -2, and 111-4 may be determined as the subgroup to which the drive signals are simultaneously input. The determination of these subgroups can be performed in units of one time cycle, which is required to locate the stylus pen.

In the above description, the subgroup is formed only in the electrode group arranged in the same direction. However, in the implementation, at least one electrode 111-3 and the second electrode group 112 in the first electrode group 111, At least one electrode 112-2 in the subgroup can be determined as a subgroup. That is, the driving signal may be simultaneously applied to at least one first electrode in the first electrode group 111 and at least one second electrode in the second electrode group 112.

As described above, in the present embodiment, since the same driving signal is simultaneously applied to the plurality of electrodes, the energy transmitted to the stylus pen can be increased. This will be described below with reference to FIG.

5 is a diagram showing the magnitude of the generated signal of the stylus pen according to the number of electrodes to which the drive signal is input.

Referring to FIG. 5, it can be seen that as the number of electrodes to which a driving signal is input increases, the intensity of a signal generated from the stylus pen increases.

More specifically, the energy transferred from the touch panel 100 to the stylus pen 200 is determined by the driving voltage and the capacitance between the electrode and the pen tip of the stylus pen. When the number of electrodes to which the driving signal is applied increases As the capacitance of the pen tip increases, the size of the signal generated by the pen increases proportionally.

When the size of the signal generated by the stylus pen 200 is increased, the response signal caused by the touch panel 100 is also increased, thereby improving the sensitivity of the response signal.

Accordingly, when the touch object is a stylus pen, the controller 120 according to the present embodiment can apply a driving signal to each of a plurality of electrodes. On the contrary, if the object to be contacted is an object such as a hand, the control unit 120 can apply a driving signal in units of one electrode. Such an operation will be described with reference to Fig. 6 below.

6 is a diagram for explaining an operation of determining the position of a contact object.

Referring to FIG. 6, if it is determined that the object to be contacted is a contact object such as the hand 10, the control unit 120 may apply a driving signal in units of one electrode. Specifically, the control unit 120 controls the first electrodes 111-1, 111-2, 111-3, 111-4, 111-5, and 111-6, among the plurality of electrodes, Can be input.

For example, the controller 220 applies a driving signal to the first electrode 111-1 during a predetermined first time interval, and applies a driving signal to the plurality of second electrodes 112-1 and 112-2 , 112-3, 111-4, 111-5, and 112-6, respectively.

When a response signal is received from the plurality of second electrodes, the controller 220 applies a driving signal to the second electrode 111-2 in the second time interval, and during the application of the driving signal, (112-1, 112-2, 112-3, 111-4, 111-5, and 112-6).

The controller 120 may repeat the above-described process for the next first electrode. In the illustrated example, the first electrode includes six first electrodes, and the controller 120 may perform the operation of applying the six driving signals, and may perform the operation of receiving the six response signals during the application of the driving signals.

In the above description, the reception of the response signal is described as one channel unit, that is, one electrode unit. However, the present invention can be implemented in a plurality of channel units. For example, as shown in FIG. 6, after the signal of the first electrode 111-3 is applied, the measurement of the response signals of the three second electrodes 112-3, 112-4, and 112-5 is performed simultaneously You may.

 On the other hand, at the time of implementation, the above-described process is performed only for the first electrode around the position according to the position measured in the previous process, that is, only the measurement for some electrodes among all the first electrodes is performed, Can be performed.

The control unit 120 determines a change in the intensity of the response signal based on the response signal at the second electrode with respect to each of the plurality of first electrodes in the above process and determines the position of the contact object based on the detected change in intensity can do.

For example, when the change in intensity of the received response signal at three second electrodes with respect to three first electrodes is as shown in Table 1, the value of the table corresponds to the change in capacitance at the intersection of the first electrode and the second electrode . Therefore, it is possible to determine that the touch of the user is made at the corresponding point because the change of the signal intensity at the first electrode 111-3 and the second electrode 112-3 is the greatest.

term Rx signal strength at 112-2 Rx signal strength at 112-3 Rx signal strength at 112-4 A driving signal is applied at 111-2 2 8 3 Driving signal is applied at 111-3 5 15 6 Driving signal is applied at 111-4 2 4 5

Figs. 7 to 9 are views for explaining an operation of determining the position of an object having a resonance circuit. Fig.

Referring to FIG. 7, the controller 120 may determine a subgroup to which a drive signal is to be applied based on the position of the resonant object 200 detected in the previous process. For example, if it is determined in the previous procedure that the resonant object 200 is located on the first electrode 111-3, the controller 120 controls the three first electrodes 111-2, 111-3, 111-4 ) Can be determined as a subgroup to simultaneously apply a driving signal. Then, the controller 120 can collectively input the same driving signals to the electrodes (for example, 111-2, 111-3, and 111-4) in the determined subgroup.

As shown in FIG. 5, when the same driving signal is input to three first electrodes, not shown, the magnitude of the signal generated by the stylus pen 200 increases. Therefore, the response signal of the stylus pen 200 can be transmitted to each electrode even when the stylus pen 200 is somewhat distant from the touch panel 100 (i.e., the hover state). Accordingly, the touch panel 100 according to the present embodiment can receive an air command from a user.

The control unit 120 may receive the response signals from the electrodes by a predetermined number of units. The control unit 120 can alternately perform the application of the drive signal and the reception of the response signal as described above. Such operation will be described in detail below with reference to Fig.

Referring to FIG. 8, a line indicated by black in the drawing is an electrode to which a driving signal is applied, and a line subjected to hashing is a line on which a response signal is measured. Referring to FIG. 8A, the controller 120 may apply a driving signal to the electrodes 111-2, 111-3, and 111-4 within the predetermined first subgroup.

After a predetermined time after the application of the driving signal, the controller 120 receives a response signal from the first electrode 111-2 as shown in FIG. 8B. After the predetermined time unit, the controller 120 may apply a driving signal to the electrodes 111-2, 111-3, and 111-4 in the first subgroup as shown in 8c. As shown in FIG. 8D, the controller 120 may receive the response signal of the first electrode 111-3, which is the next electrode.

That is, the controller 120 may apply a driving signal at a time point equal to a predetermined period unit (FIGS. 8A, 8C, 8E, 8G, 8i, and 8K). 8B, 8D, 8F, 8H, 8J, and 8L, the controller 120 sequentially receives response signals of a plurality of electrodes during a period in which each driving signal is applied (i.e., a period during which no driving signal is applied) can do.

The control unit 120 can determine the position of the stylus pen based on the response signal received at each electrode. Specifically, the controller 120 may determine the position of the stylus pen 200 based on the ratio between the response signal received at the first electrode and the response signal received at the second electrode.

8, it has been described that the response signal is received only for six electrodes among the twelve electrodes. However, this is only one embodiment, and in the implementation, it is also possible to receive a response signal for all twelve electrodes have. Also, in the implementation, it may be realized that the response signal is received only for five or less electrodes. And the electrode receiving the response signal is not fixed, but the number and position can be selected based on the coordinates of the object measured in the previous process.

In the description of FIG. 8, a driving signal is applied in units of one sub group. However, the determination of the sub group may be adaptively determined according to the size of a response signal. This will be described with reference to FIG.

Referring to FIG. 9, when the stylus pen is touched to the touch panel 100 as shown in FIG. 9B, many channels do not need to transmit driving signals. Accordingly, the controller 120 may cause only the first electrode 111-3 corresponding to the previously sensed position to transmit the driving signal.

9A, 9C, and 9D, when the stylus pen is in a floating state in which the stylus pen is not touched with the touch panel, the controller 120 controls the first electrode corresponding to the previously sensed position and the first electrode So that the electrodes can transmit the driving signal together. Here, the hover means a state where the stylus pen is spaced apart from the touch panel without being touched with the touch panel. And can be classified into general proximity, low hover, and high hover depending on the distance interval, and the distinction can be classified according to the size of the detected response signal.

For example, when the size of the previously sensed response signal is small, that is, when the stylus pen is significantly spaced from the touch panel (in the case of a high hover as shown in FIG. 9D), the controller 120 performs a low hover The driving signal can be transmitted not only to the plurality of transverse electrodes (first electrodes) but also to the plurality of longitudinal electrodes (second electrodes) so that more resonance signals can be transmitted to the stylus pen than in the case where the resonance signals are transmitted.

That is, the controller 120 can determine the number of electrodes to which a driving signal is transmitted based on the magnitude of the largest response signal. For example, when the largest response signal is greater than or equal to a predetermined first magnitude (i.e., when it is determined that the first response signal is larger than the predetermined first magnitude), the controller 120 outputs only the first electrode 111-3, Can be applied. If the largest response signal is less than the first size and is greater than the second size (i.e., low hover), the controller 120 controls the first electrode of the plurality of first electrodes 111-3 and the first electrodes 111-2, 111-4 within a predetermined range. If the largest response signal is less than the second size (i.e., high hover), the controller 120 controls the first electrode 111-3 of the largest response signal among the plurality of first electrodes, The second electrode 112-5 of the largest response signal among the plurality of second electrodes and the second electrodes 112-4 and 112-7 within a predetermined range, Can be simultaneously applied.

In the above description, only the number of the electrodes to which the driving signal is simultaneously applied is varied based on the size of the response signal. However, if another method capable of measuring the distance between the stylus pen and the touch panel is provided, So that the number of electrodes can be varied.

On the other hand, in the above description, the contact position of the user's hand or the tip position of the stylus pen is determined when only a contact object such as a user's hand touches or only the stylus pen contacts the touch panel. However, even when the stylus pen is used, the tip of the stylus pen and the user's hand can be placed on the touch panel at the same time. The change of the driving signal according to the case where the hands are further disposed and the driving method considering the change of the driving signal will be described later with reference to FIGS. 10 to 19 below.

FIGS. 10 and 11 are views for explaining the connection state between the touch panel and the stylus pen.

10 and 11, when the stylus pen 200 is disposed between the plurality of electrodes 112-2 and 112-3, the stylus pen 200 includes a plurality of electrodes 112-2 and 112-3 ) And a respective capacitance is formed. Accordingly, two driving signals are transmitted to the stylus pen 200, so that more energy is transmitted toward the stylus pen 200 as described with reference to FIG. In the illustrated example, the capacitance of the stylus pen 200 is formed only by two electrodes. However, in order to facilitate the explanation, the influence of the capacitance formed between the stylus pen 200 and the electrode on the response signal size It is a representative example of a lot of ingredients.

11, the stylus pen 200 may include a conductive tip 210, a resonant circuit 220 and a ground 230. The ground 230 may be connected to the stylus pen 200 And is grounded through the user's body when the stylus pen 200 is held by the user. This connection form is shown in Fig. 12 as an equivalent circuit. The specific configuration and operation of the stylus pen 200 will be described later with reference to FIGS. 40 to 43. FIG.

12 is a diagram showing an equivalent circuit when the stylus pen 200 is disposed between a plurality of electrodes 112-2 and 112-3.

Referring to FIG. 12, the touch panel 100 and the stylus pen 200 are connected through a plurality of capacitors. Specifically, the electrodes of the touch panel 100 are connected to the resonance circuit of the stylus pen 200 through the first capacitors 313-1, 313-2, and 313-3 formed between the respective electrodes and the conductive tip of the stylus pen. Lt; / RTI >

The first capacitors 313-1, 313-2 and 313-3 are connected to the conductive tip 210 of the stylus pen 200 and the capacitors C_cp-1, C_cp-2, C_cp-3). As described above, the stylus pen 200 is disposed between the electrode 112-2 and the electrode 112-3, and a large capacitance is formed in comparison with the electrode located near the stylus pen and the pen tip. .

One end of the resonance circuit unit 220 is connected to the first capacitors 313-1, 313-2 and 313-3 and the other end is commonly connected to the second capacitor 314 and the third capacitor 316 . Here, the capacitor and the inductor constituting the resonant circuit in the stylus pen 200 have a capacitance and an inductance value for generating a predetermined response signal.

The second capacitor 314 is a capacitance C_pg between the case of the stylus pen 200 (that is, the ground) and the ground of the touch panel 100.

The third capacitor 316 is the capacitance (C_pb) between the case (i.e., ground) of the stylus pen 200 and the user's hand. The third capacitor 316 is connected to the ground of the touch panel 100 through the fourth capacitor 315. Here, the fourth capacitor 315 is a capacitance C_bg between the user's hand and the ground of the touch panel 100.

Here, when the capacitance values of the second capacitor 314, the third capacitor 316, and the fourth capacitor 315 are sufficiently large, the impedance at the resonance frequency of the pen becomes very small, It is possible to simplify the equivalent circuit of Fig. That is, as shown in FIG. 15A, the driving signal is transmitted to the driving circuit only through the capacitances 313 formed between the conductive tips of the stylus pen.

14, the capacitances cb1, cb2 and cb3 formed between the user's hand and the electrodes in addition to the capacitances ct1 and ct2 formed between the electrodes and the conductive tip ).

When the same drive signal is applied to the plurality of electrodes 112-2, 112-3, and 112-4 in this connection state as in the previous drive method, the drive signal is applied between the conductive tips of the stylus pen (Cb1, cb2, cb3) with the user's hand at the same time as the capacitances (ct1, ct2) The driving signal is transmitted to the ground of the resonance circuit portion in that the user's hand is connected to the ground portion of the stylus pen 200. [

Meanwhile, the resonance circuit part generates resonance using the voltage difference between the signal transmitted through the conductive tip 210 and the ground part of the stylus pen, that is, the pen case in the present embodiment, When applied to the ground of the pen, the voltage difference between the conductive tip and the ground of the stylus pen is reduced, thereby reducing the size of the resonance signal. This operation will be described in more detail below with reference to FIG.

Fig. 16 is a diagram for explaining the influence of a hand-transmitted response signal.

Referring to FIG. 16, the touch panel 100 and the stylus pen 200 are connected through a plurality of capacitors. More specifically, the electrode of the touch panel 100 is connected to one end of the resonance circuit 220 of the stylus pen 200 through the first capacitors 313-1 and 313-2, And is connected to the other end of the resonance circuit 220 through a third capacitor 316.

Here, the fifth capacitor 317 is the capacitance (C_cb) between the electrode and the user's hand.

Therefore, the driving signal generated at the channel electrode is transmitted to the case A of the pen through the capacitance C_cb between the electrode and the user's hand and the capacitance C_pb between the ground of the user's hand and the stylus pen.

As the driving signal is applied to the ground, the ground of the stylus pen 200 does not ideally have a stable ground state, and the voltage level changes according to the driving signal. On the other hand, when the potential of the A point (that is, the ground) moves according to the driving signal, the voltage difference between the A point and the B point is reduced, The size of the signal is reduced.

In order to solve this problem, in the present embodiment, when a contact object such as a user's hand touches the touch panel 100 at the same time with the stylus pen, the driving signal is not applied to the point where the user's hand is expected to be positioned, A driving signal having a phase difference of 180 degrees is applied to prevent the size of the resonance signal caused by the stylus pen from being reduced. This operation will be described below with reference to FIG.

Fig. 17 is a diagram for explaining an operation of applying a drive signal when a hand is touched. Fig.

Referring to FIG. 17, the user's hand 10 holds the stylus pen 200 and is positioned on the touch panel 100. It is assumed that the conductive tip of the stylus pen 200 is positioned on the electrodes 806 and 807 and the user's hand 10 is disposed on the electrodes 806 to 811 in the following description.

In this case, the controller 120 applies the same first driving signal to the electrodes 806 and 807 on which the stylus pen 200 is placed, and the electrodes 803 and 804 disposed adjacent to the electrodes to which the first driving signal is applied , 809, and 810 may apply a second driving signal having a phase difference of 180 degrees to the first driving signal.

At this time, the control unit 120 may ground the electrodes 801, 802, 805, 808, 811, and 812 to which the first driving signal and the second driving signal are not applied. In the illustrated example, the electrodes 805 and 808, which are grounded between the electrodes to which the first driving signal and the second driving signal are applied, are disposed. However, in the illustrated embodiment, The electrodes to which the two drive signals are applied may be arranged continuously. Also, the controller 120 may have a floating state instead of grounding the electrodes 801, 802, 805, 808, 811, and 812. Here, the floating state means that the specific electrode is opened without being grounded or connected to another circuit configuration.

The effects of this driving method will be described below with reference to FIG.

18 is a diagram for explaining the effect of the application operation as shown in Fig. More specifically, FIG. 18A shows a case where a drive signal is transmitted to the ground portion of the stylus pen 200 through a hand, FIG. 18B shows a case where an ideal ground is provided to a ground portion of the stylus pen, (Specifically, the voltage between the point B and the point A in Fig. 16) in the case where the second driving signal having a phase difference of 180 degrees is driven to be transmitted to the ground portion of the stylus pen Fig.

18, when all the electrodes are driven by a driving signal having the same phase (i.e., in the case of FIG. 18A) as shown in FIG. 16, the capacitance of the electrode and the hand, C_cb, The driving signal having the same phase as that of the pen tip is transmitted through the capacitance C_pb between the stylus pen and the stylus pen. Therefore, the voltage difference VB-VA for driving the resonance circuit is significantly smaller than when there is no driving signal input to the hand . That is, when the driving signal is transmitted to the grounding portion of the stylus pen 200 through the hand, the voltage difference between both ends of the resonance circuit 200 is reduced, and the energy that can be utilized for resonance is reduced.

Referring to FIG. 18B, the voltage Vb applied to the pen tip can be used for resonance because it has an ideal ground. Specifically, since the driving signal is transmitted to only one end of the resonance circuit of the stylus pen, the driving signal VB can be used as it is for generating the response signal of the resonance circuit.

Referring to FIG. 18C, since the driving signal having the 180-degree phase difference is provided to the ground of the stylus pen, the voltage difference between the both ends of the resonance circuit is increased as compared with the case where the ground is ideal. Thus, the energy that can be utilized for resonance increases, and thus the stylus pen can generate a resonance signal of a larger size. That is, according to the present invention, the control unit 120 provides a driving signal having a phase different from that of the area where the stylus pen is located, in the area where the user's hand is located (or the area expected to be positioned) do.

In the above description, only the second electrodes are operated as described above. However, in the implementation, a driving signal may be similarly applied to electrodes arranged in a matrix form as shown in FIG. 19 .

19 is a view for explaining an operation of applying a driving signal in the channel electrode portion having the shape as shown in Fig.

Referring to FIG. 19, the first subgroup 111-3, 111-4, 112-3, and 112-4 and the second subgroup 111-2, 111-5, 112-2, and 112-5, and the third subgroups 111-1, 111-6, 112-1, and 112-6. The control unit 120 may simultaneously apply a general first driving signal to the first subgroups 111-3, 111-4, 112-3, and 112-4. At this time, the control unit 120 can ground or float the second subgroups 111-2, 111-5, 112-2, and 112-5, and the third subgroups 111-1, 111-6, 112 -1, and 112-6, a second driving signal having a phase difference of 180 degrees from the first driving signal may be applied.

The driving signal may be transmitted to the first electrode and the second electrode at the same time. The driving signal transmitted from the first electrode and the driving signal transmitted from the second electrode may have a phase difference depending on the position of the stylus pen. This will be described below with reference to FIGS. 20 and 21. FIG.

FIG. 20 is a diagram for explaining the influence of the delay of the drive signal transmission at the electrode.

Referring to FIG. 20, it is assumed that the stylus pen 200 is located near the first electrodes 111-5 and 111-6 and the second electrodes 112-5 and 112-6. In this case, the controller 120 may simultaneously apply the same driving signal to the first electrodes 111-5 and 111-6 and the second electrodes 112-5 and 112-6.

Accordingly, the driving signal generated by the driving unit 130 is transmitted to the stylus pen through the A point and the B point, and also to the C point and the D point.

On the other hand, a transparent electrode can be used as an electrode of the touch screen, and the resistance of the transparent electrode from the start to the end of the channel reaches tens of k ohms. Also, since the channel electrode has a parasitic capacitance formed with the surrounding conductors, the signal passing through the channel electrode has a delay due to the high resistance of the channel electrode and the parasitic capacitance between the peripheral conductors. That is, as the position of the pen is longer at the starting point of the channel electrode, the delay of the driving signal becomes larger.

Accordingly, if the same driving signal is applied to the first electrode 111-6 and the second electrode 112-6 as shown in FIG. 20, the driving signal is transmitted through the second electrode 112-6 to the stylus pen 200 And a driving signal is transmitted to the stylus pen 200 through the first electrode 111-6 after a predetermined delay time. Accordingly, the two drive signals transmitted to the stylus pen 200 do not have the same phase but have a constant phase difference.

Specifically, when a signal having the same phase as in FIG. 21 (a) is applied to points A and C, a drive signal reached at point B through point A and a drive signal reached at point D through point C Since the lengths of the paths are different, they experience different resistances and parasitic capacitances, so that they have different phases instead of the same phase. When the two driving signals transmitted to the stylus pen 200 have a phase difference, a relatively small signal is transmitted to the pen tip as compared with a case where the driving signal is transmitted in the same phase. 21 (b), in order to solve the resonance signal attenuation phenomenon due to the phase difference between the signals having passed through the different paths, the phase difference between the driving signal applied to the point A and the driving signal applied to the point C . In this case, at the points B and D closest to the point at which the actual stylus pen is located, the pre-created artificial phase difference is adjusted to be offset from the natural phase difference that occurs when passing through the electrodes having different lengths. Can minimize the phase difference between the signals transmitted to the pen tip of the pen tip.

Accordingly, the controller 120 controls the first driving signal applied to the first electrode and the second driving signal applied to the second electrode to have different phase differences from each other according to the detected position of the stylus pen . For example, as shown in FIG. 21 (b), by applying a predetermined time delay to the drive signal applied to the point A, the phases of the drive signals transmitted to the pen tip at the points B and D can be made equal have.

In the implementation, information on the delay time is stored in a look-up table for each position of the intersection of the first electrode and the second electrode where the pen tip is to be positioned, and the control unit 120 May delay and apply a driving signal applied to a specific electrode by a time value of a look-up table value.

22 is a diagram showing a configuration of a receiving unit according to the first embodiment. Specifically, the receiving unit 140 according to the first embodiment amplifies the response signal to improve the sensitivity.

Referring to FIG. 22, the receiving unit 140 may include an amplifying unit 141.

The amplifying unit 141 amplifies and outputs a response signal transmitted from each electrode. Specifically, the amplifier 141 may be implemented as an amplifier in which one input terminal of two input terminals is grounded and a response signal is input to the other input terminal.

As described above, the receiving section 140 amplifies and uses the signal using the amplifying section 141, so that it is possible to improve the reception sensitivity of the response signal.

Meanwhile, in the illustrated example, the receiving unit 140 includes only one amplifying unit 141, and the repetitive signal processing is performed for the plurality of electrodes in order to process the response signals of the plurality of electrodes. Therefore, at the time of implementation, the processing time can be shortened by using a plurality of amplification units as shown in FIG.

23 is a diagram showing a configuration of a receiving unit according to the second embodiment. Specifically, the receiving unit 140 'according to the second embodiment amplifies the response signal by differential amplifying the response signal to improve the sensitivity.

Referring to FIG. 23, the receiving unit 140 'may include a differential amplifier 142.

The differential amplifier 142 (or the differential amplifier) differentially amplifies and outputs a plurality of response signals transmitted from the plurality of electrodes. Specifically, the differential amplifier 142 may be implemented as an amplifier in which one input terminal of two input terminals is input as one response signal and the response signal is input to another input terminal. This amplifier may be the same amplifier as in FIG. 22, or may be a differential amplifier specialized for differential amplification. The operation principle of the differential amplifier 142 will be described below with reference to Figs. 24 and 25. Fig.

24 and 25 are views for explaining the operation of the differential amplifier of FIG.

As shown in Fig. 24, a signal received from an electrode is generally received together with a desired signal as well as noise. This noise degrades the quality of the signal and degrades the sensitivity of the system. In the case of display noise, such as the display noise, noise is introduced into all channels at similar magnitudes.

Therefore, as shown in FIG. 25, when the difference between the two response signals is amplified, the noise components are canceled each other, and only the difference between the signals is amplified to obtain a signal of good quality.

Accordingly, the receiving unit 140 'according to the second embodiment can remove the noise included in the two response signals by amplifying the two response signals received from the two electrodes.

Meanwhile, one of the two response signals input to the differential amplifier 142 can be continuously changed, while the other one can be fixed or changed to any one. For example, the (first method) differential amplification section 142 may be configured to differentially amplify the response signals of successively adjacent two electrodes (for example, after differential amplification of 111-1 and 111-2, 111-3 are subjected to differential amplification), (second method), the response signals of the two electrodes are differentially amplified (for example, 111-3 and 111-4 after differential amplification of 111-1 and 111-2) Differential amplification of the response signal of one electrode and the response signal of the remaining electrodes may be performed (for example, 111-1 (default) and 111-2) after the differential amplification, 1 and 111-3). In the case of the third scheme, the electrode used as a default may be a separate electrode for noise removal, not the electrode 110 where the position measurement is used.

As described above, the receiving unit 140 'according to the second embodiment can remove the noise using the differential amplifying unit 142, thereby improving the receiving sensitivity.

In the illustrated example, the receiving unit 140 'includes only one differential amplification unit 142, and the repetitive signal processing is performed for the plurality of electrodes in order to process the response signals of the plurality of electrodes. Therefore, at the time of implementation, the processing time can be shortened by using a plurality of differential amplifying units as shown in FIG.

26 is a diagram showing a configuration of a receiving unit according to the third embodiment. Specifically, the receiving unit 140 " according to the third embodiment enhances the sensitivity of a response signal by extracting only signals corresponding to a predetermined frequency band.

Referring to FIG. 26, the receiver 140 'may include an amplifier 141, an ADC 143, and a signal processor (or DSP) 144.

The amplifying unit 141 sequentially amplifies and outputs each of the response signals transmitted from the respective electrodes.

The ADC unit 143 converts the amplified response signal into a digital signal.

The signal processing unit 144 can extract a predetermined frequency component from the difference between the plurality of response signals converted into the digital signal.

As described above, the signal received from the electrode is received together with the desired signal as well as noise. In order to effectively control such noise, in this embodiment, only the frequency component corresponding to the frequency domain of the response signal can be extracted using the signal processor 144. [

As described above, the receiving unit 140 " according to the third embodiment can extract noise components by extracting only predetermined frequency components, thereby improving reception sensitivity of response signals.

In the illustrated example, the receiving unit 140 "includes only one amplifying unit 141. In order to process the response signals of the plurality of electrodes, the repeating signal processing is performed by the number of the plurality of electrodes. The processing time can be shortened by using a plurality of amplification units as shown in Fig.

In the illustrated example, only the response signal of the second electrode in the second electrode group 112 is amplified, but the response signal of the first electrode in the first electrode group can also be amplified.

Fig. 27 is a diagram showing a configuration of a receiving unit according to the fourth embodiment. Specifically, the receiving unit 140 "'according to the fourth embodiment amplifies the response signal to improve the sensitivity and improves the detection speed using a plurality of amplifiers.

Referring to FIG. 27, the receiving unit 140 '' may include a plurality of amplifiers 141-1, 141-2, and 141-3.

Each of the amplifying units 141-1, 141-2, and 141-3 amplifies and outputs a response signal transmitted from each electrode in parallel. Specifically, the amplifying units 141-1, 141-2, and 141-3 may be implemented as amplifiers. In the first receiving period, the amplifying units 141-1, 141-2, (111-1, 111-2, 111-3) can be simultaneously amplified and output. In the second reception period, the amplifiers 141-1, 141-2, and 141-3 can simultaneously amplify and output the response signals of the electrodes 111-4, 111-5, and 111-6.

As described above, the receiving unit 140 "'according to the fourth embodiment processes the response signals in parallel on a channel-by-channel basis, thereby improving the processing speed. For example, have.

In the illustrated example, each of the amplifying units 141-1, 141-2, and 141-3 amplifies only the response signal of the first electrodes in the first electrode group. However, -1, 141-2, and 141-3 may also amplify the response signals of the second electrodes in the second electrode group.

In the illustrated example, the amplification section is composed of three amplifiers, but in the implementation, it may be composed of two amplifiers or four or more amplifiers (for example, six).

28 is a diagram showing a configuration of a receiving unit according to the fifth embodiment. Specifically, the receiving unit 140 "" according to the fifth embodiment improves the sensitivity by differential amplifying the response signal to remove noise, and improves the sensing speed using a plurality of differential amplifiers.

Referring to Fig. 28, the receiving unit 140 "" may include a plurality of differential amplifying units 142-1, 142-2, and 142-3.

Each of the differential amplifiers 142-1, 142-2, and 142-3 amplifies and outputs two response signals, which are transmitted from the two electrodes, in parallel. Specifically, each of the differential amplifying units 142-1, 141-2, and 141-3 is implemented as a differential amplifier, and is connected to the electrodes 111-1, 111-3, -2, 111-4, and 111-6, respectively, and output the amplified signals.

As described above, the receiving unit 140 "" according to the fifth embodiment processes the response signals in units of three channels in parallel, thereby improving the processing speed. For example, the processing speed may be three times faster than in the case of FIG.

In the illustrated example, the differential amplifiers 142-1, 142-2, and 142-3 perform differential amplification only on the response signals of the first electrodes in the first electrode group. However, The units 142-1, 142-2, and 142-3 can also perform differential amplification on the response signals of the second electrodes in the second electrode group. In the implementation, the electrodes in the first electrode group and the electrodes in the second electrode group may be subjected to differential amplification.

In the illustrated example, the differential amplifier section is composed of three differential amplifiers. However, the differential amplifier section may include two differential amplifiers or four or more differential amplifiers (for example, six differential amplifiers).

29 is a diagram showing a configuration of a receiving unit according to the sixth embodiment. Specifically, the receiving unit 140 "'according to the sixth embodiment improves the sensitivity of the response signal by extracting only the signal corresponding to the frequency band of the response signal, and improves the detection speed using a plurality of amplifiers to be.

Referring to FIG. 29, the receiving unit 140 '' 'includes a plurality of amplifying units 141-1, 141-2, and 141-3, a plurality of ADC units 143-1, 143-2, and 143-3, And a signal processing unit 144 '.

Each of the amplifying units 141-1, 141-2, and 141-3 amplifies and outputs a response signal transmitted from each electrode in parallel. Specifically, in the first reception period, the amplification units 141-1, 141-2, and 141-3 amplify the response signals of the electrodes 111-1, 111-2, and 111-3 in parallel, can do. In the second reception period, the amplification units 141-1, 141-2, and 141-3 amplify and output the respective response signals of the electrodes 111-4, 111-5, and 111-6 in parallel have.

Each of the ADC units 143-1, 143-2, and 143-3 can convert each of the response signals amplified by the amplifiers 141-1, 141-2, and 141-3 into digital signals.

The signal processing unit 144 'receives the response signal changed to the digital signal from the plurality of ADC units 143-1, 143-2, and 143-3, and extracts a predetermined frequency component from each of the plurality of response signals have.

As described above, the receiving unit 140 "'according to the sixth embodiment processes the response signals in units of three channels in parallel, thereby improving the processing speed. For example, the processing speed is three times faster than in the case of FIG.

In the illustrated example, each of the amplifying units 141-1, 141-2, and 141-3 amplifies only the response signal of the first electrode in the first electrode group. However, in the implementation, each of the amplifying units 141 -1, 141-2, and 141-3 can also amplify the response signal of the second electrode in the second electrode group.

26 and 29, a signal amplified by an amplifier is used. However, a differential amplifier may be used in place of the amplifiers of FIGS. 26 and 29 at the time of implementation. This will be described later with reference to FIG.

30 is a diagram showing a configuration of a receiving unit according to the seventh embodiment. The receiving section 140 "" in accordance with the seventh embodiment differentially amplifies the response signal to remove the noise, extracts only the signal corresponding to the frequency band of the response signal, thereby improving the sensitivity of the response signal, To improve the detection speed.

Referring to FIG. 30, the receiving unit 140 '' 'includes a plurality of differential amplifying units 142-1, 142-2 and 142-3, a plurality of ADC units 143-1, 143-2 and 143-3, And a signal processing unit 144 '.

Each of the differential amplifiers 142-1, 142-2, and 142-3 amplifies and outputs two response signals, which are transmitted from the two electrodes, in parallel. Specifically, each of the differential amplifying units 142-1, 142-2, and 142-3 includes electrodes 111-1, 111-3, and 111-5 and electrodes 111-2, 111-4, and 111-6 ) Can be amplified in parallel and output in parallel.

The ADC units 143-1, 143-2, and 143-3 convert the response signals amplified by the differential amplifiers 142-1, 142-2, and 142-3 into a digital signal in parallel .

The signal processing unit 144 'receives the response signal changed to the digital signal from the plurality of ADC units 143-1, 143-2, and 143-3, and extracts a predetermined frequency component from each of the plurality of response signals have.

As described above, the receiving unit 140 "" in accordance with the seventh embodiment processes the response signals in parallel in units of three channels, which improves the processing speed. Further, in two stages of differential amplification and specific frequency component extraction, The sensitivity of the response signal can be improved.

In the illustrated example, each of the differential amplifying units 142-1, 142-2, and 142-3 amplifies the response signal of the first electrodes in the first electrode group. However, 142-1, 142-2, and 142-3 may amplify the response signals of the second electrodes in the second electrode group.

31 is a diagram showing a configuration of a receiving unit according to the eighth embodiment. The receiving unit 140 '' '' according to the eighth embodiment is an embodiment in which the response signal is differentially amplified to remove noise, and the detection speed is improved using a plurality of differential amplifiers.

Referring to FIG. 31, the receiving unit 140 '' '' 'may include a plurality of differential amplifiers 145-1, 145-2, and 145-3.

Each of the differential amplifiers 145-1, 145-2, and 145-3 amplifies and outputs two signals received from the two electrodes in parallel in a differential manner. Specifically, one end of each of the differential amplifying units 145-1, 145-2, and 145-3 can receive a response signal of any one of two predetermined electrodes through the first connecting unit 161, And the other end can commonly receive the reception signal of any one of the plurality of electrodes through the second connection portion 162. [

For example, when receiving the response signals of the first electrodes 111-1, 111-2, and 111-3, the first connection unit 161 connects the first electrodes 111-1, 111-2, and 111-3 Are connected to one ends of the differential amplification units 145-1, 145-2 and 145-3 and one of the electrodes 111-4, 111-5 and 111-6 not connected to the differential amplification unit Can be connected to the other end of the differential amplification section.

As described above, the receiving unit 140 "" 'according to the eighth embodiment processes the response signals in parallel in units of three channels, thereby improving the processing speed. The difference between the signal received from the receiving electrode and the signal received from the reference electrode can be effectively removed so that the sensitivity of the response signal can be improved. It is possible to improve the dynamic range of the system by amplifying only the signal components except for the noise components common to the receiving electrode and the reference electrode.

In the illustrated example, the differential amplifiers 145-1, 145-2, and 145-3 amplify the response signals of the first electrodes in the first electrode group. However, 145-1, 145-2, and 145-3 may also amplify the response signals of the second electrodes in the second electrode group. In the illustrated example, only three differential amplifiers are illustrated, but two differential amplifiers may be used or four or more differential amplifiers may be used.

31, although a differential amplifier is used to remove noise, an amplifier and another subtracter circuit may be used in implementation. This will be described later with reference to FIGS. 32 to 36.

32 is a diagram showing a configuration of a receiving unit according to the ninth embodiment. Specifically, the receiving unit 140 "" "in accordance with the ninth embodiment improves the sensitivity of a response signal using a dedicated amplifier and a subtractor for removing noise, and improves the detection speed using a plurality of amplifiers Fig.

Referring to FIG. 32, the receiver 140 "" includes a plurality of amplifiers 146-1, 146-2, 146-3, and 146-4, a plurality of subtractors 147-1, 147-2, and 147-4 -3).

Each of the amplifying units 146-1, 146-2, and 146-3 amplifies and outputs a response signal transmitted from each electrode in parallel. Specifically, in the first reception period, the amplifiers 146-1, 146-2, and 146-3 amplify the response signals of the electrodes 111-1, 111-2, and 111-3 in parallel, can do. In the second reception period, the amplifiers 146-1, 146-2, and 146-3 amplify and output the respective response signals of the electrodes 111-4, 111-5, and 111-6 in parallel have.

The amplifying unit 146-4 amplifies the voltage of any one of the plurality of electrodes 111-1, 111-2, 111-3, 111-4, 111-5, and 111-5 through the second connection unit 162, Amplifies the received signal of the electrode and outputs it. For example, in the above-described first reception period, any one of the electrodes 111-4, 111-5, and 111-6 that are not connected to the amplification units 146-1, 146-2, and 146-3 In the second reception period, any one of the electrodes 111-1, 111-2, and 111-3, which are not connected to the amplifiers 146-1, 146-2, and 146-3, can be amplified. The received signal can be amplified.

Here, the amplifiers 146-1, 146-2, 146-3, and 146-4 may use a trans-impedance amplifier that converts a current input to a voltage output.

Each of the subtractors 147-1, 147-2, and 147-3 receives the response signal amplified by the amplifying units 146-1, 146-2, and 146-3, The difference of the signal can be outputted.

As described above, the receiving unit 140 "" " " according to the ninth embodiment processes the response signals in units of three channels in parallel, thereby improving the processing speed. In addition, the differential amplification is performed using the reception signal of the other electrode which does not use the response signal, so that the noise in the response signal can be efficiently removed, thereby improving the sensitivity of the response signal.

In the illustrated example, each of the amplifying units 146-1, 146-2, and 146-3 amplifies the response signal of the first electrodes in the first electrode group. However, in the implementation, each of the amplifying units 146 -1, 146-2, and 146-3 may amplify the response signals of the second electrodes in the second electrode group. In the illustrated example, only four amplification units are used. However, in the implementation, three amplification units may be used or four or more amplification units (for example, seven (amplifiers 6 for amplifying the response signals of the respective electrodes One amplifier for calculation of subtraction + subtraction)) may be used.

33 is a diagram showing a configuration of a receiving unit according to the tenth embodiment. Specifically, the receiving unit 140 "" 'according to the tenth embodiment enhances the sensitivity of the response signal by extracting only the signals corresponding to the frequency bands of the amplifiers and the subtractors and the dedicated amplifiers for removing noise, And the detection speed is improved by using a plurality of amplifiers.

Referring to FIG. 33, the receiver 140 '' '' 'includes a plurality of amplifiers 146-1, 146-2, 146-3 and 146-4, a plurality of subtractors 147-1 and 147-2, 147-3, a plurality of ADC units 143-1, 143-2, 143-3, and a signal processing unit 144 '.

Each of the amplifying units 146-1, 146-2, and 146-3 amplifies and outputs a response signal transmitted from each electrode in parallel. Specifically, in the first reception period, the amplifiers 146-1, 146-2, and 146-3 amplify the response signals of the electrodes 111-1, 111-2, and 111-3 in parallel, can do. In the second reception period, the amplifiers 146-1, 146-2, and 146-3 amplify and output the respective response signals of the electrodes 111-4, 111-5, and 111-6 in parallel have.

The amplifying unit 146-4 amplifies the voltage of any one of the plurality of electrodes 111-1, 111-2, 111-3, 111-4, 111-5, and 111-5 through the second connection unit 162, Amplifies the received signal of the electrode and outputs it. For example, in the above-described first reception period, any one of the electrodes 111-4, 111-5, and 111-6 that are not connected to the amplification units 146-1, 146-2, and 146-3 In the second reception period, any one of the electrodes 111-1, 111-2, and 111-3, which are not connected to the amplifiers 146-1, 146-2, and 146-3, can be amplified. The received signal can be amplified.

Each of the subtractors 147-1, 147-2, and 147-3 receives the response signal amplified by the amplifying units 146-1, 146-2, and 146-3, The difference of the signal can be outputted.

The ADC units 143-1, 143-2, and 143-3 may convert the signals output from the subtractors 147-1, 147-2, and 147-3 into digital signals.

The signal processing unit 144 'receives the response signal changed to the digital signal from the plurality of ADC units 143-1, 143-2, and 143-3, and extracts a predetermined frequency component from each of the plurality of response signals have.

As described above, the receiving unit 140 "" " " according to the tenth embodiment processes the response signals in units of three channels in parallel, thereby improving the processing speed. In addition, since noise is removed in two steps of differential amplification and specific frequency component extraction using the response signal of the other electrode which does not use the response signal, the sensitivity of the response signal can be improved.

In the illustrated example, each of the amplifying units 146-1, 146-2, and 146-3 amplifies the response signal of the first electrodes in the first electrode group. However, in the implementation, each of the amplifying units 146 -1, 146-2, and 146-3 may amplify the response signals of the second electrodes in the second electrode group. In the illustrated example, only four amplification units are used. However, in the implementation, three amplification units may be used or four or more amplification units (for example, seven (amplifiers 6 for amplifying the response signals of the respective electrodes One amplifier for calculation of subtraction + subtraction)) may be used.

34 is a diagram showing a configuration of a receiving unit according to the eleventh embodiment. Specifically, the receiver 140 '' '' '' according to the eleventh embodiment enhances sensitivity of a response signal by extracting only a signal corresponding to a frequency band of a response amplifier and a subtracter and a dedicated amplifier for removing noise, And the detection speed is improved by using a plurality of amplifiers.

34, the receiver 140 "includes a plurality of amplifiers 146-1, 146-2, 146-3, and 146-4, a plurality of subtractors 147-1, 147-2, A plurality of second amplifying units 148-1, 148-2 and 148-3, a plurality of ADC units 143-1, 143-2 and 143-3 and a signal processing unit 144 ' Lt; / RTI >

Each of the amplifying units 146-1, 146-2, and 146-3 amplifies and outputs a response signal transmitted from each electrode in parallel. Specifically, in the first reception period, the amplifiers 146-1, 146-2, and 146-3 amplify the response signals of the electrodes 111-1, 111-2, and 111-3 in parallel, can do. In the second reception period, the amplifiers 146-1, 146-2, and 146-3 amplify and output the respective response signals of the electrodes 111-4, 111-5, and 111-6 in parallel have.

The amplifying unit 146-4 amplifies the voltage of any one of the plurality of electrodes 111-1, 111-2, 111-3, 111-4, 111-5, and 111-5 through the second connection unit 162, Amplifies the received signal of the electrode and outputs it. For example, in the above-described first reception period, any one of the electrodes 111-4, 111-5, and 111-6 that are not connected to the amplification units 146-1, 146-2, and 146-3 In the second reception period, any one of the electrodes 111-1, 111-2, and 111-3, which are not connected to the amplifiers 146-1, 146-2, and 146-3, can be amplified. The received signal can be amplified.

Each of the subtractors 147-1, 147-2, and 147-3 receives the response signal amplified by the amplifying units 146-1, 146-2, and 146-3, The difference of the signal can be outputted.

Each of the second amplifying units 148-1, 148-2, and 148-3 amplifies and outputs the signals output from the respective subtractors 147-1, 147-2, and 147-3 in parallel.

The ADC units 143-1, 143-2, and 143-3 may convert the signals output from the second amplifiers 148-1, 148-2, and 148-3 into digital signals.

The signal processing unit 144 'receives the response signal changed to the digital signal from the plurality of ADC units 143-1, 143-2, and 143-3, and extracts a predetermined frequency component from each of the plurality of response signals have.

As described above, the receiving unit 140 "" "" according to the eleventh embodiment processes the response signals in parallel for each of three channels, thereby improving the processing speed. It is possible to improve the sensitivity of the response signal by improving the sensitivity of the response signal by amplifying the signal in two stages. .

In the illustrated example, each of the amplifying units 146-1, 146-2, and 146-3 amplifies the response signal of the first electrodes in the first electrode group. However, in the implementation, each of the amplifying units 146 -1, 146-2, and 146-3 may amplify the response signals of the second electrodes in the second electrode group.

35 is a diagram showing a configuration of a receiving unit according to a twelfth embodiment. Specifically, the receiver 140 '' '' '' '' according to the twelfth embodiment extracts only the signals corresponding to the frequency bands of the amplifiers and subtractors and the dedicated amplifiers for removing noise, thereby improving the sensitivity of response signals , And the detection speed is improved by using a plurality of amplifiers.

35, the receiving section 140 '' '' '' includes a plurality of amplifiers 146-1, 146-2, 146-3 and 146-4, an inverter 147-4, a plurality of adders 147 A plurality of second amplification units 148-1, 148-2, and 148-3, a plurality of ADC units 143-1, 143-2, and 143-3, And a signal processing unit 144 '.

Each of the amplifying units 146-1, 146-2, and 146-3 amplifies and outputs a response signal transmitted from each electrode in parallel. Specifically, in the first reception period, the amplifiers 146-1, 146-2, and 146-3 amplify the response signals of the electrodes 111-1, 111-2, and 111-3 in parallel, can do. In the second reception period, the amplifiers 146-1, 146-2, and 146-3 amplify and output the respective response signals of the electrodes 111-4, 111-5, and 111-6 in parallel have.

The amplifying unit 146-4 amplifies the voltage of any one of the plurality of electrodes 111-1, 111-2, 111-3, 111-4, 111-5, and 111-5 through the second connection unit 162, Amplifies the received signal of the electrode and outputs it. For example, in the above-described first reception period, any one of the electrodes 111-4, 111-5, and 111-6 that are not connected to the amplification units 146-1, 146-2, and 146-3 In the second reception period, any one of the electrodes 111-1, 111-2, and 111-3, which are not connected to the amplifiers 146-1, 146-2, and 146-3, can be amplified. The received signal can be amplified.

The inverter 147-4 can invert the output of the amplifier 146-4.

The adders 147-5, 147-6, and 147-7 add the outputs of the inverters 147-4 to the reception signals amplified by the amplifiers 146-1, 146-2, and 146-3, .

Each of the second amplifying units 148-1, 148-2, and 148-3 amplifies and outputs the signals output from the adders 147-5, 147-6, and 147-7 in parallel.

The ADC units 143-1, 143-2, and 143-3 may convert the signals output from the second amplifiers 148-1, 148-2, and 148-3 into digital signals.

The signal processing unit 144 'receives the response signal changed to the digital signal from the plurality of ADC units 143-1, 143-2, and 143-3, and extracts a predetermined frequency component from each of the plurality of response signals have.

As described above, the receiving unit 140 "" "'according to the twelfth embodiment processes the response signals in parallel in units of three channels, thereby improving the processing speed. The sensitivity of the response signal can be improved by performing the differential amplification using the signal and the extraction of the specific frequency component in two stages. Further, the sensitivity of the response signal can be further improved by amplifying the signal in two stages have.

In the illustrated example, each of the amplifying units 146-1, 146-2, and 146-3 amplifies the response signal of the first electrodes in the first electrode group. However, in the implementation, each of the amplifying units 146 -1, 146-2, and 146-3 may amplify the response signals of the second electrodes in the second electrode group.

36 is a diagram showing a configuration of a receiving unit according to the thirteenth embodiment. Specifically, the receiving unit 140 "" "" " according to the thirteenth embodiment amplifies the response signal, performs differential amplification for noise removal, extracts only the signal corresponding to the frequency band of the response signal, And the detection speed is improved by using a plurality of amplifiers.

Referring to FIG. 36, the receiver 140 '' '' '' 'includes a plurality of amplifiers 146-1, 146-2, 146-3, and 146-4, a plurality of differential amplifiers 149-1 and 149-4 -2, and 149-3, a plurality of ADC units 143-1, 143-2, and 143-3, and a signal processing unit 144 '.

Each of the amplifying units 146-1, 146-2, and 146-3 amplifies and outputs a response signal transmitted from each electrode in parallel. Specifically, in the first reception period, the amplifiers 146-1, 146-2, and 146-3 amplify the response signals of the electrodes 111-1, 111-2, and 111-3 in parallel, can do. In the second reception period, the amplifiers 146-1, 146-2, and 146-3 amplify and output the respective response signals of the electrodes 111-4, 111-5, and 111-6 in parallel have.

The amplifying unit 146-4 amplifies the voltage of any one of the plurality of electrodes 111-1, 111-2, 111-3, 111-4, 111-5, and 111-5 through the second connection unit 162, Amplifies the received signal of the electrode and outputs it. For example, in the above-described first reception period, any one of the electrodes 111-4, 111-5, and 111-6 that are not connected to the amplification units 146-1, 146-2, and 146-3 In the second reception period, any one of the electrodes 111-1, 111-2, and 111-3, which are not connected to the amplifiers 146-1, 146-2, and 146-3, can be amplified. The received signal can be amplified.

Each of the differential amplifying units 149-1, 149-2, and 149-3 receives the signals output from the amplifiers 146-1, 146-2, and 146-3 and the signals output from the amplifying unit 146-4 In parallel, and outputs the amplified signals. More specifically, one end of each of the differential amplifying units 149-1, 149-2, and 149-3 is connected to the output end of each of the amplifying units 146-1, 146-2, and 146-3, And may be connected to the output terminal of the part 146-4.

The ADC units 143-1, 143-2, and 143-3 can convert the signals output from the differential amplifiers 149-1, 149-2, and 149-3 into digital signals.

The signal processing unit 144 'receives the response signal changed to the digital signal from the plurality of ADC units 143-1, 143-2, and 143-3, and extracts a predetermined frequency component from each of the plurality of response signals have.

As described above, the receiving unit 140 "" "" " " according to the thirteenth embodiment processes the response signals in units of three channels in parallel, thereby improving the processing speed. In addition, noise can be removed in two steps of performing differential amplification using a reception signal of another electrode that does not use a response signal and extracting a specific frequency component, thereby improving the sensitivity of a response signal. In addition, the sensitivity of the response signal can be further improved by amplifying the signal in two steps.

37 is a diagram for explaining the operation of the receiver according to the sixth to thirteenth embodiments.

Referring to FIG. 37A, the receiving unit 140 may receive a response signal of the electrodes of the first electrode on a three-channel basis as shown in 37a. Specifically, the same drive signal is simultaneously applied to the three first electrodes, and the response signals of the three first electrodes (for example, 111-2, 111-3, and 111-4) Lt; / RTI > After the reception of three channel units, the same driving signal is applied again, and the response signals of three different electrodes can be simultaneously received.

Referring to FIG. 37B, the receiving unit 140 may receive a response signal of the electrodes of the second electrode on a three-channel basis, as shown in FIG. Specifically, the same driving signal is simultaneously applied to the three first electrodes, and the response signals of the three second electrodes (for example, 112-2, 112-3, and 112-4) Lt; / RTI >

Referring to FIG. 37C, the receiving unit 140 receives six response signals transmitted from six electrodes in parallel. Specifically, the same driving signal is simultaneously applied to the three first electrodes, and three first electrodes (for example, 111-2, 111-3, and 111-4) and three second electrodes The response signals of the electrodes (for example, 112-2, 112-3, and 112-4) can be simultaneously received.

As described above, the receiving unit 140 according to the present embodiment processes response signals in units of a plurality of channels, thereby improving the response processing speed. On the other hand, the number of channels received at one time may vary depending on the distance from the surface of the stylus pen on the touch panel. For example, when the stylus pen is brought into contact with the surface, it is possible to reduce the number of simultaneously receiving channels and also reduce the number of electrodes to be measured. Conversely, when the stylus pen is spaced apart from the surface, the number of receiving channels can be increased at the same time, and the number of electrodes to be measured can be increased. At the time of implementation, the number of simultaneous measurements and the total number of measurement electrodes may be determined inversely proportional to each other.

In the above description, one receiving unit receives both the response signal from the stylus pen 200 and the response signal of a contact object such as a hand. However, according to the embodiment of the present invention, . Such an example will be described below with reference to FIG.

38 is a diagram showing a configuration of a receiver according to the fourteenth embodiment.

Referring to FIG. 38, the touch panel 100 'includes a channel electrode unit 110', a first driving unit 130-1, a second driving unit 130-2, a first receiving unit 140-1, A receiving unit 140-2, an MCU 150, and a connection unit 160. [

The channel electrode unit 110 'may have a plurality of electrodes corresponding to the size of the touch panel. For example, when the touch panel has a size of 12.1 inches, the channel electrode unit 110 'includes 47 first electrodes 111-1, 111-2, 111-3, ..., 111- And 63 second electrodes 112-1, 112-2, 112-3, ..., 112-61, 112-62, and 112-63 arranged in the vertical direction can do. On the other hand, when the size of the touch panel is 5.7 inches, the channel electrode portion may include 18 first electrodes and 32 second electrodes. In addition, when the size of the touch panel is 10.1 inches, the channel electrode portion may include 39 first electrodes and 52 second electrodes. Although only three panel sizes are mentioned above, they may be implemented in different sizes, and the number of channel electrode units may be different from the number of electrodes described above.

The first driving unit 130-1 is a driving unit that operates when a stylus pen is sensed, and simultaneously applies a driving signal to at least two or more electrodes among the plurality of electrodes. The operation of the first driving unit 130-1 has been described in detail with reference to FIGS. 2 to 5, and a repeated description thereof will be omitted.

The second driving unit 130-2 is a driving unit that operates when a touch object such as a hand is sensed, and applies a driving signal to the plurality of first electrodes. Specifically, the second driving unit 130-2 may apply a driving signal in units of one electrode or a driving signal in units of a plurality of electrodes. The operation of the second driving unit 130-2 has been described in detail with reference to FIG. 6, and redundant description will be omitted. Here, the touch object may include, for example, a hand (more specifically, a finger).

When the stylus pen is sensed, the first receiving unit 140-1 receives a response signal from each of the plurality of electrodes in a section in which no driving signal is applied. The first receiving unit 140-1 may be configured as any one of receiving units according to various embodiments shown in FIG. 22 to FIG. For example, the first receiving unit 140-1 may include six amplifiers capable of simultaneously amplifying six response signals, and an additional amplifier to be an output of the six amplifiers and a differential output, that is, seven amplifiers. have.

The second receiving unit 140-2 receives a response signal from a plurality of second electrodes within a period in which a driving signal is applied, when a touch object is sensed. Specifically, while the driving signal is being applied to any one of the first electrodes in the second driving unit 130-2, the second receiving unit 140-2 can sequentially receive the response signals of the plurality of second electrodes have. At this time, the second receiving unit 140-2 may receive a response signal in units of a plurality of channels. In the above description, the drive signal is applied to the first electrode and the response signal is received on the second electrode side. However, in the implementation, the drive signal is applied to the second electrode side, .

The MCU 150 recognizes the contacted object and controls the first driving unit 130-1, the second driving unit 130-2, the first driving unit 130-1, the second driving unit 130-2, and the first driving unit 130-2 so as to receive a driving signal and a response signal according to the driving method corresponding to the recognized object, And can control the receiving unit 140-1, the second receiving unit 140-2, and the connecting unit 160. For example, when the contacted object is a stylus pen, the MCU 150 controls the first driving unit 130-1 and the connecting unit 160 so that the first driving unit 130-1 generates a driving signal and provides the driving signal to the electrode And controls the first receiving unit 140-2 and the connecting unit 160 so that a response signal is received in a section in which no driving signal is transmitted. If the object to be contacted is a hand, the MCU 150 controls the second driving unit 130-2 and the connection unit 160 so that the second driving unit 130-2 generates a driving signal, The second receiving unit 140-2 and the connection unit 160 may be controlled so that the response signal is received within the interval.

The MCU 150 can determine the position of the stylus pen or the position of the hand based on the received response signal.

The connection unit 160 selectively connects the plurality of electrodes to the first driving unit 130-1 or the second driving unit 130-2 or selectively connects the plurality of electrodes to the first receiving unit 140-1 or the second receiving unit 130-2, (140-2). The detailed operation of the connection unit 160 has been described in detail with reference to FIG. 20, and redundant description will be omitted.

Although only two driving units and two receiving units have been described above, the present invention can be implemented with one driving unit and two receiving units, or two driving units and one receiving unit. That is, the first driving unit 130-1 and the second driving unit 130-2 may be implemented as one configuration as shown in FIG. 3, and the first receiving unit 140-1 and the second receiving unit 130-2 2 receiving unit 140-2 may also be implemented in one configuration.

Meanwhile, the signal received by the touch panel 100 is composed of a response signal received from the stylus pen 200 and noise introduced through a display or a user's hand. In order to accurately measure the position of the stylus pen 200, the response signal of the stylus pen to be measured must have a large signal-to-noise ratio (SNR) in comparison with noise introduced from other causes.

In order to have a high signal-to-noise ratio, there is a method of increasing the size of the response signal and a method of preventing noise from entering. Hereinafter, a method of increasing the SNR in the above two aspects will be described.

First, the driving sequence of the present invention includes a Tx section for resonating the stylus pen 200 and an Rx section for measuring a response signal received from the stylus pen 200. [ In the Tx section, a method of increasing the response signal of the stylus pen may be more effective than a method of preventing the influx of noise. Accordingly, in one embodiment of the present invention, a driving signal is applied to a plurality of electrodes other than one electrode at the time of application of a driving signal. Further, in a further embodiment, the driving signals may be applied to the electrodes expected to locate the stylus pen at the same time, and the other electrodes may be grounded or floated. As described above, the duplicated description of these operations is omitted.

In order to prevent the driving signal from being transmitted to the ground of the stylus pen through the user's hand, a driving signal applied to the electrode, which is expected to be positioned on the stylus pen, and a driving signal having a phase difference of 180 degrees, .

However, a method of applying a driving signal having a phase difference of 180 degrees to electrodes other than the plurality of pen tip driving electrodes may be a good way of improving the response signal of the stylus pen. However, The electrode needs to be driven, so that the power consumption is increased. Therefore, in order to reduce power consumption, it is necessary to limit the number of electrodes applying a signal having a phase difference of 180 degrees. One way to implement this is to determine the position of the user's hand when the user's hand touches the touch panel and to determine the phase opposite to the signal applied to the portion where the pen tip touches only the portion of the user's hand A method of applying an excitation signal, or the like can be used. Using this method, the number of electrodes for applying a signal having a phase difference of 180 degrees can be minimized.

On the other hand, since the magnitude of the response signal of the stylus pen 200 is mostly determined in the Tx section, a method of preventing noise from flowing in the Rx section, unlike the Tx section, may be effective. When a human hand is brought close to an electrode of a touch panel, a considerable amount of noise enters from the hand. Therefore, the receiving unit 140 receives not only the response signal received from the stylus pen 200 but also the noise introduced from the hand. As a result, when the hand touches the touch panel and the handwriting is performed, the SNR is considerably lowered as compared with the case where the hand is released and handwritten. In order to improve this, it is possible to connect electrodes other than the plurality of electrodes for receiving the response signal of the stylus pen 200 to the ground of the receiving end. Such an example will be described later with reference to Fig. 39 below.

Fig. 39 is a diagram for explaining the operation of the connection section when receiving a response signal. Fig.

39A, when the stylus pen 200 is disposed between the plurality of electrodes 112-2 and 112-3, the second electrodes 112-2 and 112-3 are used to determine the position of the stylus pen 200, 3, and 112-4 are necessary. Accordingly, the control unit 120 can control the connection unit 160 to connect the plurality of electrodes to receive the response signal to the receiving unit 140 based on the position of the stylus pen 200 previously sensed. At this time, the control unit 120 may control the connection unit 160 so that the remaining electrodes 112-1, 112-5, and 112-6 are grounded.

As the remaining electrodes 112-1, 112-5, and 112-6 are grounded, the upper portion of the noise introduced from the hand is discharged to the ground of the receiving end, and a plurality of electrodes Only a small amount of noise flows into the reception units (112-2, 112-3, and 112-4) and enters the reception unit (140). As a result, the noise component is reduced in the input signal to the receiving unit 140, thereby improving the SNR.

In the above description, only the second electrodes are operated as described above. However, in the implementation, as shown in FIG. 39B, for the electrodes arranged in the matrix form, Can be performed.

39B, when the stylus pen 200 is disposed between the plurality of electrodes 112-2 and 112-3, the positions of the second electrodes 112-2 and 112-3 in order to determine the position of the stylus pen 200, 112-3, 112-4, 111-2, 111-3, and 111-4. If the receiving unit 140 is able to receive a response signal in units of three channels, the controller 120 controls the plurality of electrodes 112-2 to receive a response signal based on the position of the previously sensed stylus pen 200 , 112-3, and 112-4 and the receiving unit 140 are connected to each other. At this time, the controller 120 controls the connection of the remaining electrodes 111-1, 111-2, 111-3, 111-4, 111-5, 111-6, 112-1, 112-5, (160).

The control unit 120 controls the connection unit 160 to connect the plurality of electrodes 111-2, 111-3 and 111-4 to the receiving unit 140 and the remaining electrodes 111-1, 111-5, 111-6, 112-1, 112-2, 112-3, 111-4, 112-5, and 112-6 may be grounded.

In the above description, the response signal of the second electrode and the response signal of the first electrode are separately received. However, in the implementation, at least one of the plurality of first electrodes and at least one of the plurality of second electrodes The first electrode and the second electrode that are not connected to the receiving unit can be grounded.

Fig. 40 is a diagram showing a specific configuration of the stylus pen of Fig. 1;

Referring to FIG. 40, the stylus pen 200 may include a conductive tip 210, a resonant circuit 220, and a ground 230. The stylus pen 200 may be embodied in the shape of a pen, for example.

The conductive tip 210 forms a capacitance with at least one electrode of the plurality of electrodes in the touch panel 100. The conductive tip 210 may be formed of, for example, a metallic tip. And the conductive tip 210 may be inside the nonconductive material or a portion of the conductive tip 210 may be exposed to the outside. In addition, the conductive tip 210 may further include an insulation portion for preventing direct contact of the conductive tip 210 with the outside in order to soften the sense of handwriting during use.

The resonant circuit portion 220 includes a parallel connection circuit composed of an inductor and a capacitor connected to the conductive tip.

The resonant circuit portion 220 may receive energy for resonance through a capacitive coupling between at least one electrode in the touch panel 100 and the conductive tip. Specifically, the resonance circuit unit 220 can resonate with a drive signal input from the touch panel 100. [ Also, the resonance circuit unit 220 can output a resonance signal by resonance after the input of the driving signal is stopped. For example, the resonance circuit section 220 can output a sinusoidal waveform signal having a resonance frequency of the resonance circuit section.

In addition, the resonance frequency of the resonance circuit 220 may be varied by varying the capacitance of the capacitor or the inductance of the inductor according to the contact pressure of the conductive tip. This operation will be described later with reference to FIG.

In addition, the resonance frequency of the resonance circuit unit 220 can be varied by varying the capacitance of the capacitor or the inductance of the inductor according to the user's operation. This operation will be described later with reference to FIG.

41 is a diagram showing a circuit diagram of the stylus pen of Fig.

41, the resonance circuit unit 220 includes an inductor 221 and a capacitor 222, one end of which is connected to the conductive tip 210, and the other end of which is grounded to the case 230 of the stylus pen .

The inductor 211 and the capacitor 222 are connected in parallel to operate as a resonant circuit. Such a resonant circuit can have a high-impedance characteristic at a specific resonant frequency.

42 is a diagram showing a circuit diagram of a stylus pen according to another embodiment.

Referring to FIG. 42, the resonance circuit unit 220 'may include an inductor 221, a capacitor 222, and a variable capacitor 224.

The inductor 211 and the capacitor 222 are connected in parallel to operate as a resonant circuit.

The variable capacitor 224 is connected in parallel with the resonant circuit, and the capacitance can be varied according to the contact pressure of the conductive tip. Accordingly, when the contact pressure of the conductive tip changes, the capacitance of the variable capacitor is varied, and the resonance frequency can be varied.

As described above, the resonance frequency of the stylus pen 200 'according to the second embodiment is changed according to the contact pressure with the touch panel 100, and the touch panel 100 is operated with the stylus pen 200' The contact pressure of the stylus pen 200 'can be sensed according to the variable amount of the resonance frequency as well as the position of the stylus pen 200'.

In the above description, the variable capacitor is used to vary the resonance frequency. However, in the implementation, the variable inductor, which can vary in inductance according to the contact pressure of the conductive tip, is used and the resonance circuit unit 220 ' ).

43 is a circuit diagram of a stylus pen according to another embodiment.

Referring to FIG. 43, the resonant circuit portion 220 '' may be formed of an inductor 221, a capacitor 222, a second capacitor 225, and a switch 226.

The inductor 211 and the capacitor 222 are connected in parallel to operate as a resonant circuit.

The second capacitor 225 has a predetermined capacitance.

The switch 226 can receive an on / off command of the user and selectively connect the second capacitor 225 to the capacitor 222 in parallel according to a user's on / off command. Accordingly, when the user turns on the switch, the second capacitor 225 is connected in parallel to the resonance circuit, so that the resonance frequency can be varied.

As described above, the resonance frequency of the stylus pen 200 "according to the third embodiment is changed according to the switch operation of the user, and the operating mode of the stylus pen 200 "

In the above description, the resonance frequency is varied by using the second capacitor and the switch. However, the resonance circuit 220 '' implementing the same function using the second inductor and the switch or other circuit configuration may be implemented have.

On the other hand, it is preferable that the resonance frequency varying according to FIG. 43 is not a resonance frequency range varying according to FIG. Specifically, in the implementation, the variable capacitor of FIG. 42 and the switch and the second capacitor of FIG. 43 can be implemented together. In this case, whether the change of the resonance frequency in the touch panel 100 is caused by the change of the contact pressure, The resonance frequency of the resonance circuit 220 "which varies depending on the operation of the switch 225 may be different from the range of the resonance frequency varying in accordance with the change in capacitance of the variable capacitor in Fig. 42 have.

44 is a flowchart illustrating a method of controlling a touch panel according to an embodiment of the present invention.

Referring to FIG. 44, the same driving signal is applied to a plurality of electrodes in a channel electrode unit in units of a plurality of electrodes (S4410). Accordingly, the driving signal can be transmitted to the resonance circuit of the stylus pen 200 which is approached to the touch panel 100 through capacitive coupling. At this time, the same drive signal can be simultaneously applied to the electrodes on a plurality of electrode units.

Then, a response signal caused by the resonance circuit of the stylus pen is received from each of the plurality of electrodes (S4420). Specifically, a response signal can be received from each of the plurality of electrodes within a period in which no drive signal is applied. At this time, it is possible to improve reception sensitivity by performing various signal processing on the received response signal. The receiving operation can be performed alternately with the above-described applying operation.

The position of the stylus pen is determined based on the plurality of received response signals (S4430). Specifically, the position of the stylus pen 200 can be determined based on the ratio between the response signals received from each of the plurality of electrodes. For example, when a plurality of electrodes are formed in a matrix, the ratio between the ratio of the response signal received at the first electrodes arranged in the first direction and the response signal received at the second electrodes arranged in the second direction The position of the stylus pen 200 can be determined based on the ratio.

As described above, the control method of the touch panel according to the present embodiment provides the driving signal to the stylus pen through the capacitive coupling, and the stylus pen 200 can operate even if there is no power source of its own. In addition, the control method of the touch panel according to the present embodiment provides a driving signal to the plurality of electrodes collectively, thereby providing greater energy, thereby improving the reception sensitivity and the measurement speed. In addition, the control method of the touch panel according to the present embodiment performs various signal processing on the received response signal, thereby improving the reception sensitivity of the response signal. The control method as shown in Fig. 44 can be executed on a touch panel having the configuration of Fig. 2, or on a touch panel having other configurations.

In addition, the control method as described above may be implemented as a program executable in the control unit 120 of FIG. 2, and the program may be stored in a non-transitory computer readable medium.

A non-transitory readable medium is a medium that stores data for a short period of time, such as a register, cache, memory, etc., but semi-permanently stores data and is readable by the apparatus.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, It will be understood by those skilled in the art that various changes and modifications may be made by those skilled in the art without departing from the spirit and scope of the present invention.

100: touch panel 110: channel electrode part
120: control unit 200: stylus pen
210: conductive tip 220: resonant circuit
230: Ground unit 300: Coordinate measuring system

Claims (25)

In the touch panel,
A channel electrode portion including a plurality of first electrodes arranged in a first direction and a plurality of second electrodes arranged in a second direction intersecting the first direction; And
A drive signal is applied to the electrodes in the channel electrode unit in units of a plurality of electrodes to transmit the drive signal to the resonance circuit of the stylus pen which approaches the touch panel through capacitive coupling, And a controller receiving the response signal generated from the resonance circuit of the pen from each of the plurality of electrodes to determine the position of the stylus pen including the resonance circuit. The method according to claim 1,
Wherein the capacitance between the plurality of first electrodes and the plurality of second electrodes is variable by approaching the contact object,
Wherein,
Wherein a capacitance change amount between the electrodes at a plurality of electrode intersections formed between the first electrode and the second electrode is calculated and the position of the contact object is determined based on the calculated capacitance change amount. The method according to claim 1,
Wherein,
Wherein the position of the stylus pen including the resonant circuit is determined based on a ratio between the ratio of the response signal received at the first electrode and the ratio of the response signal received at the second electrode. The method of claim 3,
Wherein,
Wherein the same driving signal is applied to all of the plurality of first electrodes. The method of claim 3,
Wherein the plurality of first electrodes comprise:
A plurality of sub-groups are divided into a plurality of sub-
Wherein,
Wherein the same driving signal is simultaneously applied to all the first electrodes in one subgroup. The method of claim 3,
Wherein,
Wherein the driving signal is simultaneously applied to the electrode of the plurality of first electrodes where the response signal is most largely received and the electrode of the most largely received electrode and within a predetermined interval. The method according to claim 1,
Wherein,
Wherein the driving signal is simultaneously applied to at least one first electrode and at least one second electrode. The method according to claim 1,
A driving unit for applying driving signals to at least two electrodes among the plurality of first electrodes; And
And a receiver for receiving a response signal of each of the plurality of first electrodes and the plurality of second electrodes within a section in which the driving signal is not applied,
Wherein,
Wherein the position of the stylus pen including the resonance circuit is determined based on a response signal received from the receiver. 9. The method of claim 8,
The receiver may further comprise:
And sequentially receives response signals of the plurality of first electrodes and the plurality of second electrodes, respectively. 9. The method of claim 8,
Wherein,
Wherein the controller controls the driving unit and the receiving unit so that application of the same driving signal to the plurality of first electrodes and reception of a response signal to each of the first electrode and the second electrode is alternately performed. 11. The method according to any one of claims 8 to 10,
The receiver may further comprise:
An amplifier for amplifying and outputting the received response signal;
An ADC for converting the amplified response signal into a digital signal; And
And a signal processing unit for extracting a predetermined frequency component from the response signal converted into the digital signal. 9. The method of claim 8,
The receiver may further comprise:
Wherein the response signal of each of the plurality of first electrodes and the plurality of second electrodes is received in parallel on a plurality of channel basis. 13. The method of claim 12,
The receiver may further comprise:
Wherein the touch panel simultaneously receives a response signal from at least one of the plurality of first electrodes and at least one of the plurality of second electrodes. 13. The method of claim 12,
The receiver may further comprise:
A parallel amplification unit amplifying each of the response signals received from the plurality of electrodes;
An ADC for converting each of the plurality of amplified signals into a digital signal; And
And a signal processing unit for extracting a predetermined frequency component from the difference between the plurality of response signals converted into the digital signal. 13. The method of claim 12,
The receiver may further comprise:
And a differential amplification unit for differentially amplifying and outputting the difference between the response signals of the first electrode and the second electrode. 13. The method of claim 12,
The receiver may further comprise:
A differential amplification unit for differentially amplifying and outputting a difference between response signals of the first electrode and the second electrode;
An ADC unit for converting the differential amplified response signal into a digital signal; And
And a signal processing unit for extracting a predetermined frequency component from the response signal converted into the digital signal. 11. The method according to any one of claims 8 to 10,
Wherein,
Wherein the controller controls the channel electrode unit so that at least one of the plurality of first electrodes and the plurality of second electrodes is grounded within a period of receiving the response signal. The method according to claim 1,
Wherein the control unit controls the channel electrode unit so that at least one electrode other than the electrode to which the drive signal is applied is grounded in a period in which the drive signal is applied. The method according to claim 1,
Wherein,
The first drive signal is applied to a plurality of first electrodes arranged continuously and the first drive signal is applied to at least one of the first electrodes except for the first electrode to which the first drive signal is applied, And applies a second drive signal having a difference between the first drive signal and the second drive signal. The method according to claim 1,
Wherein,
The first and second subgroups are divided into a first subgroup, a second subgroup, and a third subgroup continuously with the center of the received signal having the largest response signal applied thereto, and the same first drive signal is applied to the electrodes in the first subgroup, And a second driving signal which is opposite in phase to the first driving signal is applied to the electrodes in the third subgroup. 3. The method of claim 2,
Wherein,
The position of the stylus pen and the position of the contact object,
A first driving signal is applied to a plurality of electrodes corresponding to the position of the stylus pen and a second driving signal having a phase difference of 180 degrees with the first driving signal is applied to a plurality of electrodes corresponding to the position of the touch object To the touch panel. The method according to claim 1,
Wherein,
Wherein at least one first electrode of the plurality of first electrodes and at least one second electrode of the plurality of second electrodes simultaneously apply a driving signal having a different phase to each other. 23. The method of claim 22,
Wherein,
Wherein a phase difference between a first driving signal applied to the first electrode and a second driving signal applied to the second electrode is determined according to a position of the first electrode and the second electrode to which the driving signal is applied, Touch panel. 3. The method of claim 2,
A first driving unit for simultaneously applying a driving signal to at least two or more of the plurality of electrodes when the stylus pen is sensed;
A second driver for applying a driving signal to the plurality of first electrodes when a touch object is sensed;
A first receiving unit receiving a response signal from each of the plurality of electrodes within a period in which the driving signal is not applied, when the stylus pen is sensed; And
And a second receiver for receiving a response signal from the plurality of second electrodes within a period in which the driving signal is applied when the touch object is sensed. In a coordinate measuring system,
A touch panel that collectively applies driving signals in units of a plurality of electrodes; And
And a stylus pen which forms a capacitance with at least one electrode of the plurality of electrodes and receives energy for resonance through the formed capacitance,
The touch panel includes:
And receives a response signal caused by a stylus pen approaching the touch panel from each of the plurality of electrodes to determine the position of the stylus pen.

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