KR20140141942A - Detecting Touch of Input System and Touch Controller for the Same - Google Patents

Abstract

The present invention relates to a touch detection method and an touch control unit for an input system in which the received signal strength is constant and the frequency and phase of the received signal are constant in the pen input of the electromagnetic system to improve the signal sensitivity. A touch detection method of an input system including a plurality of X electrodes and Y electrodes on a panel surface, an antenna loop formed around the X electrodes and the Y electrodes, and a pen having a resonance circuit therein, A first step of dividing a first signal of a predetermined period into the amplification period and the analysis period for each electrode; and a second step of dividing the first signal into a plurality of X electrodes and a plurality of Y electrodes, A second step of sequentially applying a signal with the amplitude and the amplitude of the resonance signal to the resonance circuit of the pen, A fourth step of exciting electromagnetic waves to the antenna loop by the resonance signal and a fifth step of detecting the touch position by analyzing the electromagnetic waves excited in the analysis section. .

Description

Technical Field [0001] The present invention relates to a touch detection method for an input system,

More particularly, the present invention relates to a touch detection method for an input system in which the received signal strength is constant and the frequency and phase of a received signal are constant in an electromagnetic pen input, thereby improving signal sensitivity, and a touch controller will be.

Recently, the field of display that visually expresses electrical information signals has rapidly developed as the information age has come to a full-fledged information age. In response to this, various flat panel display devices (flat display devices) having excellent performance such as thinning, light- Display Device) has been developed to replace CRT (Cathode Ray Tube).

Specific examples of such flat panel display devices include a liquid crystal display device (LCD), a plasma display panel (PDP), a field emission display (FED) (Electro Luminescence Display Device: ELD). These devices commonly use a flat panel display panel for realizing an image. The flat panel display panel has a layer of a material having inherent light emission or optical anisotropy therebetween And a pair of transparent insulating substrates facing each other.

As described above, there is an increasing demand for adding a touch panel capable of recognizing a touch region through a human hand or a separate input means and delivering additional information to the formed display device. Currently, such a touch panel is applied to the outer surface of a display device.

According to the touch sensing method, a resistance method, a capacitance method, and an infrared ray detection prevention are classified. Recently, a capacitance method is attracting attention in consideration of convenience of manufacturing method and sensing power.

On the other hand, smart devices such as smartphones and smartbooks are increasingly used as input devices for stylus pens that can be handwritten or drawn using a pen as well as touch input using a finger as a human interface device (HID) . The stylus pen input has advantages such as more detailed input than the input by the finger, and the function of the detailed drawing and the writing of the writing.

Hereinafter, a conventional electromagnetic type input system will be described with reference to the drawings.

1 is a diagram showing a conventional electromagnetic type input system.

As shown in FIG. 1, the conventional electromagnetic type input system has a resonance circuit in the pen 10, and coordinate electrodes (A, B, C) 20 in the form of a coil are formed on the touch panel side.

In this case, after the signal is sequentially applied to the coordinate electrodes 20, the resonance signal generated by the pen internal resonance circuit is received by the coordinate electrode 20 of the touch panel again, Position.

However, since the same coordinate electrode performs both signal application and reception, it is necessary to divide the signal application period and the reception period separately and use time division. At this time, the signal is attenuated in the resonance circuit in the section where the signal is not applied, so that the received signal of the coordinate electrode of the touch panel also causes signal attenuation, which increases the noise value of the received signal, Which is a cause of dropping.

The conventional input system as described above has the following problems.

First, in the reception section of the signal, signal attenuation occurs and the signal-to-noise ratio is high, so that the signal sensitivity deteriorates.

Second, since significant signal attenuation occurs, it can not be regarded as a valid signal, and there is a restriction on the reception section in which the signal can be received.

Third, the signal generated in the reception section oscillates at a specific resonance frequency, unlike the frequency of the driving signal, because the energy stored in the resonance circuit occurs in the process of consuming energy at the resonance frequency of the LC resonance circuit. Therefore, when the driving frequency and the resonance frequency are different, the frequency of the received signal is different from the driving frequency.

Fourth, when the driving frequency and the resonance frequency are different, the frequency of the received signal is different from the driving frequency. In this case, the phase relation is not constant, and it is difficult to accurately detect the phase of the received signal.

Fifth, it is difficult to construct a circuit necessary to accurately detect the magnitude and phase of a signal from a received signal, such as a signal attenuation, a constraint on an effective reception interval, a frequency of a received signal being different from a driving frequency, And complex circuits are required for accurate detection and extraction.

Sixth, the vibration signal in the reception section represents the transient state of the LC resonant circuit, and circuit and signal analysis are more complicated than the normal circuit characteristic in general.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the problems described above, and it is an object of the present invention to provide a touch sensing method for an input system in which the received signal strength is constant and the frequency and phase of the received signal are constant, And a touch control unit.

According to another aspect of the present invention, there is provided a touch detection method for an input system including a plurality of X electrodes and Y electrodes on a panel surface, a pen having an antenna loop formed around the X and Y electrodes, A first step of dividing a first signal of a predetermined period into the amplification period and the analysis period for each of the electrodes; and a second step of dividing the first signal into a plurality of X and Y electrodes, A second step of sequentially applying a signal to each of the amplification section and the analysis section at the same frequency and amplitude in each of the amplification section and the analysis section; A fourth step of exciting electromagnetic waves to the antenna loop by the resonance signal, a fifth step of analyzing the electromagnetic waves excited in the analysis section to detect a touch position, There are characterized as comprising, including.

Meanwhile, the first signal may be applied to each electrode.

The excitation of the excitation in the fifth step is preferably performed at the off-time of the first signal in the analysis period.

The first signal is a signal obtained by dividing a square wave signal from a clock generator.

The square wave signal from the clock generator preferably has the same frequency as the resonance frequency of the resonance circuit. In this case, the first signal may be a sinusoidal wave converted from the frequency-divided square wave signal from the clock generator.

The amplification period of the first signal is from the beginning until the electromagnetic wave excited in the antenna loop becomes saturation state.

Meanwhile, in the fifth step, analysis may be performed at the off-time of the frequency-divided signal of the square wave signal from the clock generator.

The touch controller includes a clock generator for generating a square wave at the same frequency as the frequency of the resonant circuit, a signal generator for generating a square wave having a frequency equal to the frequency of the resonant circuit, A square wave generator for dividing the square wave into a sine wave, a dividing clock generator for dividing the square wave into two, a sine wave generating circuit for generating a sine wave according to the divided square wave, An amplifier for amplifying a second signal of the antenna loop excited by the resonance signal generated in the resonance circuit; an inverter for inverting the divided square wave of the frequency division clock generator; A signal extraction unit for outputting a signal of the amplification unit in accordance with an output signal of the inverter in an analysis period of the classification signal generation unit; There is further characterized in including the, ADC to convert the output of the filter portion into a digital signal, the filter unit and outputs the average value of the output of said rectifying section as a DC component; rectifying part for rectifying a group signal take-out portion signal.

Here, the drive signal generator may be a sinusoidal wave generator and a transmission gate to which the output of the frequency-divided clock generator is applied.

The division signal generator is connected to the clock generator and the shift register so as to be sequentially applied to the respective electrodes.

The signal extraction unit may include an AND gate that receives the output of the division signal generation unit and the output of the inverter, and an AND gate that receives the output of the AND gate and the output of the amplification unit, .

The touch sensing method of the input system of the present invention and the touch controller for the touch sensing method of the present invention have the following effects.

First, the drive signal application is continuously applied to each electrode without specific distinction, and there is no signal attenuation in the resonance circuit in the pen that contacts the electrode. Therefore, the signal sensitivity is improved.

Secondly, since signal attenuation does not occur in the analysis section, it is possible to extend the analysis section unlike the conventional method.

Third, the signal generated during the analysis period oscillates at the frequency of these drive signals. Further, the frequency of the reference clock signal may be set equal to the resonance frequency, and the same frequency signal may be used in the amplification section and the analysis section. It is the same as the driving frequency. In this case, the size and phase of the received resonance signal can be sensed using a phase sensitive detector (PSD), thereby improving the signal-to-noise ratio and improving the accuracy of sensing and extracting data.

Fourth, the phase relationship between the signals is constant since the frequency signal of the reference clock signal, the resonant frequency, and the extraction of the effective reception signal in the analysis section can use the same frequency signal.

The fifth point is that the resonance signal is maintained without the signal attenuation, there is no time limitation in the extraction of the validity period, the frequency of the reference clock signal, the resonance frequency and the effective reception signal are constant in phase relation using the same frequency, There is no need for a separate circuit for correcting the phase relation so that the configuration of the touch control unit can be simplified.

Sixth, the resonance signal in the analysis section shows the stationary state driven at a certain frequency, and is relatively easy to analyze the signal in comparison with the transient state.

1 is a diagram showing a conventional electromagnetic type input system
2 shows an input system of the present invention
3 is a block diagram showing an input system of the present invention and its touch control unit
FIG. 4 is a timing chart showing signals output for each configuration of FIG.
5 is a schematic diagram showing an input system of the present invention
6 is a top view of an electrode loop and antenna loop on a panel of an input system of the present invention
FIG. 7 is a graph showing a comparison of timing charts showing the resonance signals in the pen generated by the drive signals applied to the respective electrodes in the touch detection method of the input system according to the first embodiment of the present invention
FIG. 8 is a graph showing a comparison of the timing charts showing the resonance signals in the pen generated by the drive signals applied to the respective electrodes in the touch detection method of the input system according to the second embodiment of the present invention
9A to 9D are timing charts showing drive signals applied to respective electrodes in various modified examples of the second embodiment of the present invention
Fig. 10 is a timing chart of a conventional touch detection method according to the present invention, in which resonance frequencies in the resonance circuit are different from each other,

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a touch detection method and a touch control unit according to the present invention will be described in detail with reference to the accompanying drawings.

First, the input system of the present invention will be briefly described.

2 is a diagram illustrating an input system of the present invention.

2, the input system of the present invention includes a plurality of X electrodes 210 and Y electrodes (not shown, not shown, refer to 220 in FIG. 6) formed on a surface of a panel 201, And a pen having an antenna loop (400) formed in the periphery thereof and a resonance circuit (100) therein.

In the drawing, the resonance circuit 100 includes the first and second coils L1 and L2 which are separated from each other. However, the resonance circuit 100 may be embodied as one coil in some cases. The resonance circuit is connected in series with the second coil L2 to form a capacitor C. One side of the first coil L1 of the resonant circuit 100 generates the coupling capacitance of the X electrode 210 or the Y electrode and the Csx value in the vicinity of the pen surface. The resonance signal in the resonance circuit 100 generated when a drive signal is applied to the adjacent X electrode 210 or Y electrode is excited and received by the antenna loop 400. [

The driving principle when the first and second coils are shown will be described.

When driving signals are applied to the respective electrodes, capacitive coupling of the Csx value between the resonant circuit 100 of the adjacent pen and the X electrode or the Y electrode is generated, A signal is transmitted to the first coil L1 and a signal transmitted to the first coil L1 is transmitted to the second coil through magnetic coupling to cause electromagnetic resonance.

The electromagnetic resonant signal is again received by antenna loop 400. Here, the antenna loop 400 may have a relatively small amplitude relative to the resonance signal of the resonance circuit 100 due to the difference in distance from the pen or the generation of parasitic alternating current due to the peripheral electrodes, A driving signal needs to be applied to each of the electrodes.

That is, for example, when the driving signal is applied to a predetermined one of the electrodes, the electrodes are a pattern of transparent electrodes having an area component, and the parasitic alternating current So that the electromagnetic noise generated by the current can be directly received into the antenna loop 400, thereby avoiding the noise effect.

In the touch detection method of the input system of the present invention, a signal applied to each of the electrodes is changed to prevent such electromagnetic noise or signal attenuation.

Hereinafter, the configuration of the touch control unit of the input system and the signals of the respective components will be described.

FIG. 3 is a block diagram illustrating an input system and a touch control unit of the present invention, and FIG. 4 is a timing diagram illustrating signals output for respective components of FIG.

3, the touch controller 500 of the present invention includes a clock generator 510 for generating a square wave at the same frequency as the frequency of the resonance circuit in the pen, A sine wave generator 520 for converting a square wave generated from the clock generator 510 into a sinusoidal wave and a frequency divider 522 for dividing a square wave generated from the clock generator 510, A driving signal generator 531 for applying a sinusoidal wave to the first and second electrodes in accordance with the divided square wave; 2 signal; an inverter 532 for inverting the divided square wave of the frequency divider clock generator; and a control unit 530 for outputting a signal of the amplifying unit in accordance with an output signal of the inverter in the analysis period A filter unit 538 for outputting an average value of the output of the rectifying unit 537 as a DC component, a rectifying unit 537 for rectifying the output signal of the signal extracting unit 580, And an ADC 540 for converting the output of the filter unit 538 into a digital signal.

The driving signal generator 531 may include a sinusoidal wave generator 520 and a transmission gate to which the output of the frequency-divided clock generator 525 is applied.

If a square wave is applied to each of the electrodes, the sinusoidal wave generator 520 may be omitted. In this case, the output of the clock generator 510 and the output of the frequency- You can get it.

In addition, the division signal generator 533 is connected to the clock generator and a shift register for applying a signal to each electrode during each analysis period so as to be sequentially applied to the electrodes.

The signal extracting unit 580 includes an AND gate 534 which receives the output of the division signal generator 533 and the output of the inverter 532 and the output of the AND gate 534 And a transmission gate 536 having an output connected to the rectifying unit 537 and receiving the output of the amplifying unit 535.

Referring to FIG. 4, signal outputs of the respective configurations will be described below.

2, the touch detection method of the input system of the present invention includes a plurality of X electrodes and Y electrodes on a panel surface, a pen having an antenna loop formed around the X and Y electrodes and a resonance circuit inside, And the configuration of the touch control unit 500 of FIG.

First, the reference clock A having the same frequency as the resonance frequency of the resonance circuit 100 inside the pen is output through the clock generator 510.

And generates a sinusoidal wave B through the sinusoidal wave generator 520 with the same clock as the reference clock.

Subsequently, the reference clock A is divided through the frequency dividing clock generator 525 (to be a half frequency of the frequency of the reference clock), and the frequency dividing signal C is output.

The drive signal generator 531 generates an on time signal of the frequency dividing signal C on a periodic basis from the sine wave signal B using the frequency dividing signal C and the sine wave B, The first signal D is generated by leaving the sinusoidal wave B only in the period. Then, the first signal (D) is sequentially applied to the X electrodes and the Y electrodes (2000).

The first signal (D) generates a resonance signal (E) in the in-pen resonance circuit (100) according to a predetermined electrode contact of the pen.

The resonance signal E is excited to the antenna loop 400 located outside the plurality of electrodes and is generated as a received signal F in the form of an electromagnetic wave. Since the value of the received signal F is small, the amplified signal G is amplified by the amplification unit 535.

On the other hand, the frequency division signal C used for generating the driving signal D is inverted through the inverter 532 to form the inverted signal H.

The discrimination signal generator 533 outputs a signal having a high value only in the analysis period T2 so as to divide a signal within one period applied to each electrode into an amplification interval T1 and an analysis interval T2 (I). Here, one period applied to each electrode corresponds to a period obtained by dividing one frame (1 frame) by the number of electrodes provided, and corresponds to a value obtained by adding the amplification period T1 and the analysis period T2. In addition, the amplification period T1 is from the start of application of a driving signal to each electrode until the electromagnetic wave excited by the antenna loop becomes a state of a new state. The interval between the amplification interval T1 and the analysis interval T2 is set to a predetermined value in the touch control unit or in the system.

Then, the amplified signal G is extracted through the signal extraction unit 580 only during a time period during which the driving signal D is not applied, thereby generating a J signal.

3, the signal extracting unit 580 receives the inverted signal H and the delimiter signal I from the AND gate 534 and the AND gate 534 and outputs the amplified signal H ), But in some cases, the transmission gate 536 may be replaced with a switch or the like.

The extracted signal (J signal) is rectified through the rectifying section 537 to be a rectified signal K. When the rectified signal K is passed through the filter section 538 such as the low-pass filter LPF, The DC component L corresponding to the average value of the signal K is kept constant within the analysis period T2.

Since the DC component L is proportional to the resonance signal E generated when the pen contacts the specific electrode, it is possible to detect which electrode is in contact with the magnitude of the DC component L, This is used to detect the touch position of the pen by applying an algorithm such as a subsequent DSP or the like.

Meanwhile, in the touch detection method of the input system of the present invention, the drive signal D is applied to each electrode irrespective of the amplification period T1 and the analysis period T2, and through the resonance circuit 100 of the pen The generated resonance signal E is maintained at a constant value in the analysis period T2 after a predetermined value is seeded in the amplification period T1.

In addition, when the extraction signal (G signal) substantially used for touch detection is not applied to the driving signal in the analysis period Tw, noise due to the driving signal can be prevented.

5 is a schematic diagram showing an input system of the present invention.

As shown in FIG. 5, the input system of the present invention includes a panel 201 having a plurality of X electrodes and Y electrodes crossing each other and an antenna loop therearound on the display panel 50, The X and Y electrodes and the antenna loop provided on the panel 201 include a pen 1000 including a resonant circuit.

6 is a top view of an electrode loop and an antenna loop on a panel of an input system of the present invention.

As shown in FIG. 6, the panel 201 of the input system of the present invention is largely divided into an active area and an outer area.

The X electrodes 210 and the Y electrodes 220 intersecting with the first channels Tx and the second channels Rx have a bar shape and are arranged in the active region. The shape shown is a bar-shaped channel, and in some cases, the bar shape may be changed to another pattern of the capacitive type. For example, it may be a diamond pattern or some other form of polygonal shape. In any case, in the input system of the present invention, it is required to be formed in a shape having symmetry in all directions from the center to the top, bottom, left and right in order to ensure accuracy of the stylus pen touch.

An antenna loop is formed in an outer area of the panel 201 to receive an electromagnetic signal generated from the resonance circuit in the pen 100. The antenna loop 400 is formed as large as possible than the active touch region where pen input is actually performed and coordinate extraction is performed. This is to solve the edge effect in which the accuracy of coordinate extraction is deteriorated due to the asymmetry of the channel at the edge of the panel 201 in the touch detection using the pen 100. [

Meanwhile, the antenna loop 400 is a kind of tertiary coil that can induce inductance, but does not include a magnetic core having a separate physical shape. Here, the antenna loop 400 may be a coil operated through an air core.

The X electrodes 210 and the Y electrodes 220 are preferably formed as transparent electrodes for transmitting light in a display device. The X electrodes (Tx) 210 and the Y electrodes (Rx) 220 are used for applying a driving signal and the detection signals to the panel 201, respectively. And is electrically connected through the pad 230 and the routing wiring 225.

A loop pad 240 is formed at both ends of the antenna loop 400 and in parallel with a pad 230 provided at one edge of the sensor panel 201. The voltage difference between the two is controlled by a touch controller .

Meanwhile, the antenna loop 400 may be formed together with the routing wiring 225 in the same process. The panel 100 may further include a planar magnetic core in contact with the antenna loop 400 in order to improve the electromagnetic induction characteristic of the antenna loop 400. [

Hereinafter, the change of the resonance signal in the pen that is differentiated according to the drive signal application change between the conventional input system driving method and the input system of the first embodiment of the present invention will be described.

FIG. 7 is a comparative diagram of timing charts showing resonance signals in a pen generated by a driving signal applied to each electrode in a conventional touch sensing method of an input system according to the first embodiment of the present invention.

In the touch detection method of the input system of the first embodiment of the present invention, a signal applied to each electrode is a square wave. That is, the sinusoidal wave generator 520 of FIG. 3 is omitted. In this case, the reference clock A output through the clock generator 510 is directly applied to the drive signal generator 531, Only the on time of the reference clock A is applied as the driving signal D '.

In contrast, in the driving method of the conventional input system, one period during which a signal is applied to each electrode is divided into a driving period and a receiving period. In this case, an actual driving signal is applied to the electrodes only during the driving period, There is no signal.

In this case, in the conventional driving method, the resonance signal generated in the resonance circuit in the pen can gradually increase in the driving period, but there is no driving signal input in the receiving period, and signal degradation gradually occurs depending on the time.

On the other hand, in the first embodiment of the present invention, the signal of one period applied to each electrode is divided into the amplification period T1 and the analysis period T2, Signal is applied. Here, the driving period of the conventional driving method and the amplifying period of the first exemplary embodiment of the present invention may be set differently.

Here, since each on-time of the driving signal D 'occurs only within the on-time of the divided clock, the interval up to the next on-time may be relatively large as compared with the conventional driving method. However, The amplification period T1 is set until the resonance signal E is asserted and the amplitude of the signal finally obtained in the analysis period T2 is not smaller than that of the conventional resonance signal. Rather, the driving signal D 'is continuously applied to each electrode within the analysis period T2, and a constant value can be obtained without signal attenuation. That is, according to the first embodiment of the present invention, unlike the conventional method, the resonance signal having a constant value can be obtained without signal attenuation.

The actual driving signal D 'between the amplification section T1 and the analysis section T2 alternates in response to the frequency division clock signal and occurs at a time corresponding to the inverse number 1 / f of the resonance frequency .

Here, in the analysis period T2, necessary signal extraction is performed at the actual touch position in the section in which the drive signal D 'is not applied, which is referred to as an effective reception period. In this case, it is possible to substantially prevent the noise generated by the drive signal from being generated when the drive signal is not applied to the signal taking-out required for the touch position.

FIG. 8 is a comparative diagram of timing charts showing a resonance signal in a pen generated by a driving signal applied to each electrode in a conventional touch sensing method of an input system according to a second embodiment of the present invention.

FIG. 8 is a waveform of a sinusoidal wave applied to a rectangular wave in the first embodiment of the present invention shown in FIG. The same effect also occurs in this case, and the driving signal D of each electrode is obtained by putting the output of the sine wave generator 520 and the divided clock generator 525 of FIG. 3 into the driving signal generator 531.

That is, even in the second embodiment of the present invention, the actual driving signal D between the amplification section T1 and the analysis section T2 is alternately inverted by the influence of the frequency division clock signal, / f). < / RTI >

Here, in the analysis period T2, necessary signal extraction is performed at the actual touch position in the section in which the drive signal D is not applied, and this is called an effective reception period. In this case, it is possible to substantially prevent the noise generated by the drive signal from being generated when the drive signal is not applied to the signal taking-out required for the touch position. Also, unlike the conventional method, there is an effect that a resonance signal having a constant value can be obtained without signal attenuation.

9A to 9D are timing diagrams showing driving signals applied to each electrode in various modifications of the second embodiment of the present invention.

9A to 9D show that the application form of the drive signal has various forms. In the drawings, the signal form in the amplification section is shown. In the analysis section, the applied signal form is the same, but the 'idle' section indicated is equivalent to the 'effective signal receiving section'.

That is, FIG. 9A shows an application form according to the second embodiment of the present invention described above, in which the driving signal application period and the idle period are set to 1: 1 by this divided clock. Here, one period corresponds to one on / off period of the reference clock and corresponds to a reciprocal (1 / f) of the reference clock frequency f.

Here, effective signal detection necessary for actual touch detection is performed in the idle period of the analysis period within one cycle applied to the electrode.

FIG. 9B shows a case where the drive signal applied period and the idle period are set to 2: 2, where one period is equivalent to one on / off period of the reference clock and is set to a reciprocal (1 / f) of the reference clock frequency f It is significant.

FIG. 9C shows that the driving signal applied period and the idle period are set to 2: 1, and FIG. 9D shows the driving applied period and the idle period set to 1: 2.

In the modified version of FIG. 9B to FIG. 9D, the divided clock generator 525 is converted into a frequency divider clock generator having a number other than 2, Can be obtained by different internal configurations.

Meanwhile, in the touch detection method of the input system of the present invention, the driving signal application mode is not limited to the illustrated one, and the driving signal application period may be different from the idle period.

FIG. 10 is a timing chart of a touch detection method of an input system of the present invention, which is simulated by changing the resonance frequency in the resonance circuit.

As shown in FIG. 10, the driving methods of the conventional input system and the input system of the present invention differ in the driving signal applying method applied to each electrode, as described above.

That is, in the conventional method, the drive period and the reception period are separately applied, but by the specific divided clock signal of the driving method of the present invention (this clock signal in the simulation view), only the on- And the driving signal is not divided into a specific section but is continuously applied in the analysis period T2 even after the resonance signal in the resonance circuit is electrodedicated.

In addition, the extraction of the actual effective signal is performed in a section in which the drive signal is not applied in the analysis section T2, and the extraction signal can be extracted constantly in the analysis section without signal attenuation or noise.

Meanwhile, in the illustrated simulation, when a resonance signal having three different resonance frequencies is generated, the conventional and the driving method of the present invention are shown.

In fact, in the conventional driving method, when the resonance frequency different from the frequency applied as the driving signal is applied, the phase delay phenomenon gradually increases in the receiving section.

On the other hand, it can be confirmed that the signal attenuation is completely prevented in the driving method of the present invention, and the same phase relation is maintained in the amplification section and the analysis section without the phase delay phenomenon of the other resonance frequency.

That is, the features of the effective reception signal, the advantages of the signal processing circuit and the signal analysis at the application of the driving method of the touch detection method of the input system of the present invention can be confirmed.

In addition, according to the holding of the constant value of the resonance signal in the analysis section and accordingly, the effective received signal strength necessary for the final touch detection analysis is constant and the effective reception time And the frequency and phase of the effective received signal are constant. Thus, the disadvantages of the conventional driving method can be improved. Based on these advantages, it also has advantages of easy signal processing and analysis from the received signal

The foregoing description is merely illustrative of the present invention, and various modifications may be made by those skilled in the art without departing from the spirit of the present invention. Accordingly, the embodiments disclosed in the specification of the present invention are not intended to limit the present invention. The scope of the present invention should be construed according to the following claims, and all the techniques within the scope of equivalents should be construed as being included in the scope of the present invention.

100: Resonance circuit 201: Panel
210: X electrode 220: Y electrode
400: antenna loop 500: touch control unit
510: clock generator 520: sinusoidal generator
525: 2-frequency clock generator 531: driving signal generator
530: T2 register 532: Inverter
533: Division signal generator 534: AND gate
535: amplifying section 536: transmission gate
537: rectification part 538: filter part
540: ADC 580: Signal extracting section

Claims (11)

A touch detection method of an input system including a plurality of X electrodes and Y electrodes on a panel surface, an antenna loop formed around the X electrodes and Y electrodes, and a pen having a resonance circuit therein,
A first step of dividing a first signal of a predetermined period into the amplification period and the analysis period for each electrode;
A second step of applying the first signal to each of a plurality of X electrodes and Y electrodes sequentially in the amplification section and the analysis section at the same frequency and amplitude;
A third step of generating a resonance signal in the resonance circuit of the pen according to the touch of the panel surface of the pen;
A fourth step of exciting an electromagnetic wave to the antenna loop by the resonance signal; And
And a fifth step of detecting a touch position by analyzing the electromagnetic waves excited in the analysis section. The method according to claim 1,
Wherein the excitation of the excitation in the fifth step is performed at an off-time of the first signal in the analysis period. The method according to claim 1,
Wherein the first signal uses a signal obtained by dividing a square wave signal from a clock generator. The method of claim 3,
Wherein the square wave signal from the clock generator has the same frequency as the resonant frequency of the resonant circuit. 5. The method of claim 4,
Wherein the first signal is obtained by converting a square wave signal from the clock generator into a sinusoidal wave. The method according to claim 1,
Wherein the amplification period of the first signal is from the beginning until the electromagnetic wave excited by the antenna loop becomes a seeding state. The method according to claim 6,
Wherein the analysis in the fifth step is performed at an off-time of the frequency-divided signal of the square wave signal from the clock generator. A touch control unit for a touch detection method of an input system according to any one of claims 1 to 7,
A clock generator for generating a square wave at the same frequency as the frequency of the resonance circuit provided in the pen;
A division signal generator for dividing a signal applied to each of the electrodes into an amplification period and an analysis period;
A sinusoidal wave generator for converting the square wave into a sinusoidal wave;
A frequency dividing clock generator for dividing the square wave;
A driving signal generator for applying a sinusoidal wave to each electrode as a first signal according to the divided square wave;
An amplifier for amplifying a second signal of the antenna loop excited by the resonance signal generated in the resonance circuit;
An inverter for inverting the divided square wave of the frequency divider clock generator;
A signal extractor for outputting a signal of the amplification unit in accordance with an output signal of the inverter in an analysis period of the classification signal generation unit;
A rectifying unit for rectifying a signal of the signal extracting unit;
A filter unit for outputting an average value of the output of the rectifying unit as a DC component;
And an ADC for converting an output of the filter unit into a digital signal. 9. The method of claim 8,
Wherein the drive signal generator is a transmission gate to which the sinusoidal wave generator and the output of the frequency-divided clock generator are applied. 9. The method of claim 8,
Wherein the division signal generator is connected to the clock generator and the shift register so as to be sequentially applied to the respective electrodes. 11. The method of claim 10,
Wherein the signal extracting unit comprises: a logical product gate having an output of the division signal generating unit and an output of the inverter as inputs; and a transmission gate having an output of the AND gate and an output of the amplifying unit, Wherein the touch control unit comprises:

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